(2x-1)³=-8,x等于多少,
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(2x-1)³=-8,x等于多少,
(2x-1)³=-8,x等于多少,
(2x-1)³=-8,x等于多少,
(2x-1)³=(-2)³
2x-1=-2
2x=-2+1
2x=-1
x=-1/2
设y=2x-1
所以y³=-8
y=-2
-2=2x-1
2x=-1
x=-1/2
2x-1=-2
x=-1/2