求x的值：(1)8x^3=125(2) (x-5)^3+729=0（3）-8(x-3)^3=27

求x的值：(1)8x^3=125(2) (x-5)^3+729=0（3）-8(x-3)^3=27
求x的值：(1)8x^3=125(2) (x-5)^3+729=0（3）-8(x-3)^3=27

求x的值：(1)8x^3=125(2) (x-5)^3+729=0（3）-8(x-3)^3=27
(1)x^3 = 125 / 8 = (5^3) /(2^3)
x = 5/2;
(2) (x-5)^3 = -729 = (-9)^3
x -5 = -9; x = -4;
(3) (x-3)^3 = 27 /(-8) = 3^3 /(-2)^3
x- 3 = -3/2 ; x = 3/2

1。X=5/3 2.X=-22 3.X=3/2