Question

写出下列方程的根：（要有过程）

9x2=1 25x2-4=0 4x2=2

Answer 1

解析：∵9x^2=1,∴x^2=1/9,则x＝±1/3,
∵25x^2=4,∴x^2=4/25,则x＝±2/5,

∵ 4x^2=2,∴x^2=1/2,
则x＝±√(1/2)=±√2/2,

Answer 2

9x²=1
x²=1/9
x=-1/3,x=1/3

25x²-4=0
x²=4/25
x=-2/5,x=2/5

4x²=2
x²=1/2
x=-√2/2,x=√2/2