对于任何整数m，多项式（4m+5）^2-9都能（）A.被8整除B.被m整除C.被m-1整除D.被2m-1整除

更新时间2022-06-17 05:09:42

(4m+5)²-9

=(4m+5)²-3²

=(4m+5+3)(4m+5-3)

=(4m+8)(4m+2)

=8(m+2)(2m+1)

选择 A

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若"除"是"除以"

[(-2xyz)²*2(x^4)y³z]y

=4x²y²z²*2(x^4)y³z*y

=8(x^6)(y^6)*z³

=(2x²y²z)³

选择 C