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若(x+3)(x+m)=x2-2x-15,则m的值为„„„„„„„„„„„„„„„„„„„(         ...

练习题2.28W

问题详情:

若(x+3)(x+m)=x2-2x-15,则m的值为„„„„„„„„„„„„„„„„„„„(         ...

若 (x+3)(xm)=x2-2x-15,则 m 的值为„„„„„„„„„„„„„„„„„„„(                          )

A.5                                                            B.-5                                                          C.2                                                             D.-2

【回答】

B

知识点:整式的乘法

题型:选择题

标签:3x x2 2x