已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 19:41:36
已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少3

已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少
已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少

已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少
3x-5y-(x-3y-4xy)
=3x-5y-x+3y+4xy
=2x-2y+4xy
=2(x-y)+4xy
=2×(-3)+4×2
=-6+8
=2

2

3x-5y-(x-3y-4xy)=3x-5y-x+3y+4xy=2x-2y+4xy=2(x-y)+4xy=-6+8=2

2

3x-5y-(x-3y-4xy)
=3x-5y-x+3y+4xy
=2x-2y+4xy
=2(x-y)+4xy
=2×(-3)+4×2
=-6+8
=2

2