已知x-y=6,xy=-1求(2x+3y-2xy)-(x+4y+xy)-(3yx+2x-2y)的值

2024-12-28 05:27:12
推荐回答(4个)
回答1:

∵x-y=6,xy=-1
∴(2x+3y-2xy)-(x+4y+xy)-(3yx+2x-2y)
=2x+3y-2xy-x-4y-xy-3yx-2x+2y
=(2-1-2)x+(3-4+2)y+(-2-1-3)xy
=-x+y-6xy
=-(x-y)-6xy
=-6-6×(-1)
=-6+6
=0

回答2:

解:原式=y-x-6xy=0

回答3:

原式=2x+3y-2xy-x-4y-xy-3xy-2x+2y=-x+y-6xy=6-6*(-1)=12 

回答4:

合并同类项得-x y-6xy=0