已知x-xy=8,xy-y=-9,求x+y-2xy的值
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已知x-xy=8,xy-y=-9,求x+y-2xy的值已知x-xy=8,xy-y=-9,求x+y-2xy的值已知x-xy=8,xy-y=-9,求x+y-2xy的值x-xy=8(1)xy-y=-9(2)
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x-xy=8,xy-y=-9,求x+y-2xy的值
x-xy=8 (1)
xy-y=-9 (2)
则有(1)-(2):
X-XY-XY+Y=X+Y-2XY=8-(-9)=17
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