Question

若根号2x+y+|x平方-9| ---------------------- =0,求3x+6y的立方根.根号3-x

Answer 1

根号2x+y+|x平方-9| ---------------------- =0

2x+y=0 x^2-9=0

x=3 y=-6

x=-3 y=6

(1)x=3 y=-6

3x+6y=3*3-6*6=-27

3x+6y的立方根=-3

根号3-x= 根号3-3=0

(2)x=-3 y=6

3x+6y=3*(-3)+6*6=27

3x+6y的立方根=3

根号3-x= 根号3+3=根号6