求x的值:27x^2=12 (2x-3)^2=(-7)^2 √(-x)^2=2 3(2x+1)^-147=0

问题描述:

求x的值:27x^2=12 (2x-3)^2=(-7)^2 √(-x)^2=2 3(2x+1)^-147=0

27x^2=12
x^2=4/9
x=±2/3
(2x-3)^2=(-7)^2
2x-3=±7
x=5,x=-2
√(-x)^2=2
|x|=2
x=±2
3(2x+1)^2-147=0
(2x+1)^2=49
2x+1=±7
x=3,x=-4