1题:已知实数x,y满足丨x-√y丨+ √x3-27 = 0 ,求(y-5)的x次方的值.2题:(x+√2)² =3
问题描述:
1题:已知实数x,y满足丨x-√y丨+ √x3-27 = 0 ,求(y-5)的x次方的值.2题:(x+√2)² =3
答
丨x-√y丨+ √x^3-27 = 0
丨x-√y丨=0,√x^3-27 = 0
x=3
丨x-√y丨=0
丨3-√y丨=0
y=9
(y-5)的x次方
=(9-5)的3次方
=4的3次方
=64
(x+√2)² =3
(x+√2)² -3=0
(x+√2 -√3)(x+√2 +√3)=0
x=-√2+√3或x=-√2-√3