若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值

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若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值若X-Y=5,-XY=3求(7X+4Y+XY

若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值
若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值

若X-Y=5,-XY=3求(7X+4Y+XY)-6(5/6y+x-xy)d的值
(7X+4Y+XY)-6(5/6y+x-xy)
=7x+4y+xy-5y-6y-6xy
=2x-2y-5xy
=2(x-y)-5xy
=10+15
=25

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