1.64(2-x)的3次方=27
(2-x)^3=27/64
(2-x)^3=(3/4)^3
2-x=3/4
x=2-3/4
x=5/4
2.x^2-(3+x)^2=4-(3-x)^2
x^2+(3-x)^2-(3+x)^2=4
x^2+(3-x+3+x)(3-x-3-x)=4
x^2+6*(-2x)=4
x^2-12x=4
(x-6)^2=40
x-6=±√40
x=6±2√10
1.64(2-x)的3次方=27
(2-x)^3=27/64
(2-x)^3=(3/4)^3
2-x=3/4
x=2-3/4
x=5/4
2.x^2-(3+x)^2=4-(3-x)^2
x^2+(3-x)^2-(3+x)^2=4
x^2+(3-x+3+x)(3-x-3-x)=4
x^2+6*(-2x)=4
x^2-12x=4
(x-6)^2=40
x-6=±√40
x=6±2√10