# 若多项式（m+4）x³+2x²+x-1的次数是2,则m²-m的值为 A.14 B.12 C

1年前 已收到4个回答

xiney 幼苗

m+4=0
m=-4
m²-m=16+4
=20

1年前 追问

1

bxbx80 幼苗

m+4=0
m=-4
m²-m=16+4=20

1年前

2

m+4=0
m=-4

m²-m
=16+4
=20

D

1年前

1

1年前

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