Question

bai1:tim x biet

(x-2)²=1

(2x-1)^3= - 27

Answer 1

(x-2)²=1=1²=(-1)²

=>x-2=1 hoặc x-2=-1

* x-2=1=>x=3

*x-2=-1=>x=1

(2x-1)³=-27=(-3)³=>2x-1=-3

=>2x=-2=>x=-1

Answer 2

(2x-1)³=-27

(2x-1)³=(-3)³

=> 2x-1=-3

=> 2x  =-3+1

=> 2x  =-2

=>   x  =-2:2

=>  x   =-1

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