Ôn tập về giải toán
<h3 style="text-align: justify;" id="a-bagravei-toaacuten-1-tong-cua-hai-so-lagrave-121-ti-so-cua-hai-so-doacute-lagrave-56">a) Bài toán 1: Tổng của hai số là 121. Tỉ số của hai số đó là 56.</h3> <p style="text-align: justify;">Tìm hai số đó.</p> <p style="text-align: justify;">Ta có sơ đồ:</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/c1ontapgiaitoan1-1665855557.PNG.webp" width="353" height="115" alt="hinh-anh-on-tap-ve-giai-toan-1600-0" title="hinh-anh-on-tap-ve-giai-toan-1600-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div>Bài giải<p></p> <p style="text-align: left;">Theo sơ đồ, tổng số phần bằng nhau là: 5 + 6 = 11 (phần)</p> <p style="text-align: left;">Số bé là:&nbsp;121 : 11 x 5 = 55</p> <p style="text-align: left;">Số lớn là: 121 - 55 = 66</p> <p style="text-align: left;">Đáp số: 55 và 66.</p> <h3 style="text-align: justify;" id="b-bagravei-toaacuten-2-hieu-cua-hai-so-lagrave-192-ti-so-cua-hai-so-doacute-lagrave-35-tigravem-hai-so-doacute">b) Bài toán 2: Hiệu của hai số là 192. Tỉ số của hai số đó là 35. Tìm hai số đó.</h3> <p style="text-align: justify;">Ta có sơ đồ:</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/c1ontapgiaitoan2-1665856000.PNG.webp" width="305" height="125" alt="hinh-anh-on-tap-ve-giai-toan-1600-1" title="hinh-anh-on-tap-ve-giai-toan-1600-1" loading="lazy"></p> <p style="text-align: justify;">Bài giải</p> <p style="text-align: justify;">Theo sơ đồ, hiệu số phần bằng nhau là: 5 - 3 = 2 (phần)</p> <p style="text-align: justify;">Số bé là: 192 : 2 x 3 = 288</p> <p style="text-align: justify;">Số lớn là: 288 + 192 = 480&nbsp;</p> <p style="text-align: justify;">Đáp số: 288 và 480.</p> <h3 style="text-align: justify;" id="bagravei-tap">Bài tập</h3> <p style="text-align: justify;"><strong>1.</strong>a) Tổng của hai số là 80. Số thứ nhất bằng <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="0" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c37"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c39"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>7</mn><mn>9</mn></mfrac></math></mjx-assistive-mml></mjx-container> số thứ hai. Tìm hai số đó.</p> <p style="text-align: justify;">&nbsp; &nbsp;b) Hiệu của hai số là 55. Số thứ nhất bằng <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="1" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c39"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c34"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>9</mn><mn>4</mn></mfrac></math></mjx-assistive-mml></mjx-container> số thứ hai. Tìm hai số đó.</p><div class="google-auto-placed ap_container" style="width: 100%; height: auto; clear: both; text-align: center;"><ins data-ad-format="auto" class="adsbygoogle adsbygoogle-noablate" data-ad-client="ca-pub-8123786206223951" data-adsbygoogle-status="done" style="display: block; margin: auto; background-color: transparent; height: 0px;" data-ad-status="unfilled"><div id="aswift_3_host" tabindex="0" title="Advertisement" aria-label="Advertisement" style="border: none; height: 0px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block; overflow: visible; opacity: 1;"><iframe id="aswift_3" name="aswift_3" style="left: 0px; position: absolute; top: 0px; border: 0px; width: 741px; height: 0px;" sandbox="allow-forms allow-popups allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-top-navigation-by-user-activation" width="741" height="0" frameborder="0" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" src="https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8123786206223951&amp;output=html&amp;h=280&amp;adk=2020488560&amp;adf=4280474192&amp;pi=t.aa~a.1694800419~i.40~rp.4&amp;w=741&amp;fwrn=4&amp;fwrnh=100&amp;lmt=1690918708&amp;num_ads=1&amp;rafmt=1&amp;armr=3&amp;sem=mc&amp;pwprc=7302649500&amp;ad_type=text_image&amp;format=741x280&amp;url=https%3A%2F%2Fsachgiaokhoa.online%2Fon-tap-ve-giai-toan-1600G2942.html&amp;fwr=0&amp;pra=3&amp;rh=186&amp;rw=741&amp;rpe=1&amp;resp_fmts=3&amp;wgl=1&amp;fa=27&amp;uach=WyJtYWNPUyIsIjEzLjAuMCIsIng4NiIsIiIsIjExNS4wLjU3OTAuMTE0IixbXSwwLG51bGwsIjY0IixbWyJOb3QvQSlCcmFuZCIsIjk5LjAuMC4wIl0sWyJHb29nbGUgQ2hyb21lIiwiMTE1LjAuNTc5MC4xMTQiXSxbIkNocm9taXVtIiwiMTE1LjAuNTc5MC4xMTQiXV0sMF0.&amp;dt=1690918708271&amp;bpp=2&amp;bdt=1087&amp;idt=2&amp;shv=r20230727&amp;mjsv=m202307270401&amp;ptt=9&amp;saldr=aa&amp;abxe=1&amp;cookie=ID%3D94547395a8fa18af-22e89ad22ae300c0%3AT%3D1690912062%3ART%3D1690918437%3AS%3DALNI_MYNbCG599XmevrUPCYJ3Zv-Np5EvA&amp;gpic=UID%3D00000d3b2ce8a729%3AT%3D1690912062%3ART%3D1690918437%3AS%3DALNI_MaVlHrwAJeI0KGbMoTcFZDk5BwO2Q&amp;prev_fmts=0x0%2C741x280%2C741x280&amp;nras=2&amp;correlator=1289336883668&amp;frm=20&amp;pv=1&amp;ga_vid=853783082.1690918708&amp;ga_sid=1690918708&amp;ga_hid=698737942&amp;ga_fc=0&amp;u_tz=420&amp;u_his=50&amp;u_h=1080&amp;u_w=1920&amp;u_ah=1055&amp;u_aw=1920&amp;u_cd=24&amp;u_sd=1&amp;dmc=8&amp;adx=394&amp;ady=1881&amp;biw=1910&amp;bih=970&amp;scr_x=0&amp;scr_y=0&amp;eid=44759876%2C44759927%2C44759842%2C31076578%2C44788442%2C44798156&amp;oid=2&amp;pvsid=1265843512436201&amp;tmod=133538902&amp;uas=0&amp;nvt=1&amp;fc=1408&amp;brdim=0%2C25%2C0%2C25%2C1920%2C25%2C1920%2C1055%2C1920%2C970&amp;vis=1&amp;rsz=%7C%7Cs%7C&amp;abl=NS&amp;fu=128&amp;bc=31&amp;ifi=4&amp;uci=a!4&amp;btvi=2&amp;fsb=1&amp;xpc=tImvIkih7k&amp;p=https%3A//sachgiaokhoa.online&amp;dtd=9" data-google-container-id="a!4" data-google-query-id="COim24ebvIADFX1YDwIdhBoFqA" data-load-complete="true"></iframe></div></ins></div> <p style="text-align: justify;"><strong>2.</strong>Số lít nước mắm loại I có nhiều hơn số lít nước mắm loại II là 12l. Hỏi mỗi loại có bao nhiêu lít nước mắm, biết rằng số lít nước mắm loại I gấp 3 lần số lít nước mắm loại II?</p> <p style="text-align: justify;"><strong>3.</strong>Một vườn hoa hình chữ nhật có chu vi là 120m. Chiều rộng bằng <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="2" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c37"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>5</mn><mn>7</mn></mfrac></math></mjx-assistive-mml></mjx-container> chiều dài.</p> <p style="text-align: justify;">a) Tính chiều dài, chiều rộng vườn hoa đó.</p> <p style="text-align: justify;">b) Người ta sử dụng <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="3" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c32"></mjx-c><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>25</mn></mfrac></math></mjx-assistive-mml></mjx-container> diện tích vườn hoa để làm lối đi. Hỏi diện tích lối đi là bao nhiêu mét vuông?</p>