Question

已知实数x,y满足|x√y|+√x的3次方-27=0,求（y-5）x次方的值

Answer 1

◆正确的题应该是:

已知实数x,y满足|x-√y|+√(x³-27)=0.求(y-5)^x的值.

∵|x-√y|+√(x³-27)=0;

|x-√y|≥0;√(x³-27)≥0.

∴x-√y=0;且x³-27=0.

解得：x=3,y=9.

故:(y-5)^x=(9-5)³=4³=64.