x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,
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![x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,](/uploads/image/z/9331735-31-5.jpg?t=x-y%2Fx%2By%3D-1%2F2%2Cx%2Ax-xy-2y%2Ay%2Fx%2Ax-3xy%2B2y%2Ay%E7%9A%84%E8%A7%A3%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E5%90%8C%E4%B8%8A%2C%E8%AF%B7%E5%B0%86%E8%BF%87%E7%A8%8B%E5%86%99%E5%87%BA%2C)
x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,
x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?
同上,请将过程写出,
x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出,
x*x-xy-2y*y/x*x-3xy+2y*y
=(x-2y)(x+y)/(x-2y)(x-y)
=(x+y)/(x-y)
=-2
x-y/x+y=-1/2,则(x+y)/(x-y)=-2
x*x-xy-2y*y/x*x-3xy+2y*y
=[(x+y)(x-2y)]/[(x-y)(x-2y)]
=(x+y)/(x-y)
=-2
第二个式子是方程吗?
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