Question

求下列各式X的值 1,X平方=0.04 2,4【X-1】平方=324 3,9X平方-4分之1=0

Answer 1

1.x²=0.04

x²=（0.2）²

x=±0.2

2.4(x-1)²=324

(x-1)²=324/4

(x-1)²=81

(x-1)²=9²

x-1=±9

x=10或x=-8

3.9x²-1/4=0

9x²=1/4

x²=1/36

x²=(1/6)²

x=±1/6