Question

(2x-3)^2=441和8（x-1）^3=125的过程

Answer 1

(2x-3)²=441

(2x-3)²=21²

2x-3=±21

2x=3±21

x=(3±21)/2

∴X1=12

X2=-9

8（x-1)³=125

[2(x-1)]³=5³

2(x-1)=5

x-1=2.5

x=3.5