1、4X^2=9 X^2=9/4=(3/2) ^2 X=3/2
2、8X^2+125=0 无解 8X^2-125=0 有解 X^2=125/8 X=(5*根号10)/4
3、-(x-1)^3=8/27 (x-1)^3=-8/27 =-(2/3)^3 x-1=-2/3 X=1-2/3=1/3
1、4X^2=9 X^2=9/4=(3/2) ^2 X=3/2
2、8X^2+125=0 无解 8X^2-125=0 有解 X^2=125/8 X=(5*根号10)/4
3、-(x-1)^3=8/27 (x-1)^3=-8/27 =-(2/3)^3 x-1=-2/3 X=1-2/3=1/3