若x-y=5,xy=2,求4-(xy-3x+5y)+(x+y-xy)的值

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/04/28 16:40:40

若x-y=5,xy=2,求4-(xy-3x+5y)+(x+y-xy)的值
求助求助,速度,谢谢

若x-y=5,xy=2,
4-(xy-3x+5y)+(x+y-xy)的值
=4-xy+3x-5y+x+y-xy
=4-2xy+4x-4y
=4-2×2+4×5
=4-4+20
=20;
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