作业帮若（xy-2)²+|3-y|=0,求代数式（5xy-3y)-[5x-(4xy+2y-5x)]的值.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/15 13:15:56
![若（xy-2)²+|3-y|=0,求代数式（5xy-3y)-[5x-(4xy+2y-5x)]的值.](/uploads/image/z/1108695-39-5.jpg?t=%E8%8B%A5%EF%BC%88xy-2%29%26%23178%3B%2B%7C3-y%7C%3D0%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%885xy-3y%29-%5B5x-%284xy%2B2y-5x%29%5D%E7%9A%84%E5%80%BC.)
若（xy-2)²+|3-y|=0,求代数式（5xy-3y)-[5x-(4xy+2y-5x)]的值.
若（xy-2)²+|3-y|=0,求代数式（5xy-3y)-[5x-(4xy+2y-5x)]的值.
若（xy-2)²+|3-y|=0,求代数式（5xy-3y)-[5x-(4xy+2y-5x)]的值.
∵（xy-2)²+|3-y|=0
∴xy-2=0 3-y=0
xy=2 y=3
∴x=2/3 y=3
（5xy-3y)-[5x-(4xy+2y-5x)]
=5xy-3y-5x+4xy+2y-5x
=9xy-y-10x
=9*2-3-10*2/3
=18-3-20/3
=15-20/3
=25/3