Question

求x的值:(1)3x^3=51(2)x^2-(169/81)=0(3)(x-2)^3=8(4)3(2-x)^2=27

Answer 1

解:(1)3x^3=51

x^3=17

x=17开3次方

(2)x^2-(169/81)=0

x^2=169/81

x=±13/9

(3)(x-2)^3=8

x-2=2

x=4

(4)3(2-x)^2=27

(2-x)^2=9

2-x=±3

x1=5

x2=-1