<prompt> Umusho 1: Ukuze uthole umsebenzi olinganisekayo onqunyiwe ifomula 18, ifomula 19 iyinombolo engahleliwe enefomula ephakathi 20 kanye nefomula yokwehluka 21. Umusho 2: Ukuze uthole umsebenzi olinganisekayo ongaguquguquki formula _ 18, formula _ 19 iyinombolo ephakathi nendawo enefomula engahleliwe _ 20 kanye nefomula yokwehluka _ 21. Umbuzo: Ingabe umusho 1 nomusho 2 usho into efanayo? Yebo noma Cha?  <response>: Cha, akunjalo. 