x-2y²+xy=2y²-xy-()填空
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x-2y²+xy=2y²-xy-()填空
x-2y²+xy=2y²-xy-()填空
x-2y²+xy=2y²-xy-()填空
x-2y²+xy=2y²-xy-(4y²-2xy-x)
()=2y²-xy-(x-2y²+xy)
=2y²-xy-x+2y²-xy
=4y²-2xy-x
4y^2-2xy-x