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解(x+1)3-(x-1)3=40x+16oo
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解(x+1)3-(x-1)3=40x+16
oo
oo
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答案和解析
(x+1)3-(x-1)3=40x+16
3[(x+1)-(x-1)]=40x+16
3(x+1-x+1)=40x+16
6=40x+16
40x=-10
x=-1/4
3[(x+1)-(x-1)]=40x+16
3(x+1-x+1)=40x+16
6=40x+16
40x=-10
x=-1/4
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