深深蓝色海
幼苗
共回答了24个问题采纳率:91.7% 举报
1.(x-7)(x-9)(x-10+x-6)=(x-10)(x-6)(x-7+x-9)
(x-8)(x-7)(x-9)=(x-10)(x-6)(x-8)
(x-8)[(x-7)(x-9)-(x-10)(x-6)]=0
(x-8)[(x方-16x+63)-(x方-16x+60)]=0
3(x-8)=0
x=8
经检验,是
2.(x+1)(x+3)(x+6)(x+7)-(x+2)(x+2)(x+6)(x+7)=(x+2)(x+3)(x+6)-(x+2)(x+3)(x+7)
(x+6)(x+7)[(x方+4x+3)-(x方+4x+4)]=(x+2)(x+3)[(x+6)-(x+7)]
-(x+6)(x+7)=-(x+2)(x+3)
x方+13x+42=x方+5x+6
8x=-36
x=-9/4
1年前
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