x^2=25怎么做 x^2-8=0 25x^2=36
问题描述:
x^2=25怎么做 x^2-8=0 25x^2=36
答
x²=25=(±5)²
x=-5,x=5
x²-8=0
x²=8=(±2√2)²
x=-2√2,x=2√2
25x²=36
x²=36/25=(±6/5)²
x=-6/5.x=6/5