Question

已知(x-15)的平方等于169,(y-1)的立方等于负0.125,求2y-x的立方根

Answer 1

因为（x-15）^2=169
所以x-15=13或者-13
解得x=28或者2
因为（y-1）^3=-0.125
所以y-1=-0.5
解得y=0.5
所以2y-x=-27或者-1
所以立方根为：-3或者-1

Answer 2

(x-15)² = 169
x -15 = ±13
x1 = 28
x2 = 2

(y-1)³ = - 0.125
y - 1 = - 0.5
y =0.5

设 z = 2y-x
z1 = 2y-x1 = 1 - 28 = -27
z2 = 2y-x2 = 1 - 2 = -1

z1的立方根 = -3
z2的立方根 = -1

Answer 3

(x-15)的平方等于169,
∴x-15=13或x-15=-13
x=28或x=-2
(y-1)的立方等于负0.125
∴y-1=-0.5
y=0.5
2y-x=1-28=-27
或2y-x=1+2=3
∴2y-x的立方根是-3或3次根号3

Answer 4

(x-15)^2=169,x-15=±13，x=28,或x=2
(y-1)^3=-0.125,y-1=-0.5,y=0.5
所以2y-x的立方根=(1-28)的立方根=(-27)的立方根=-3；
或2y-x的立方根=(1-2)的立方根=(-1)的立方根=-1。

Answer 5

(x-15)平方等于169
（x-15+13)(x-15-13)=0
x=2,x=28
,(y-1)的立方等于负0.125
y-1=-0.5
y=0.5
x=2,2y-x=-3,立方根为-³√3
x=28,y=-29 ，立方根为-³√29