упростите выражение (х+2у)(х-у)+у(у-х)
(x+2y)(x-y)+y(y-x)=x^2-xy+2xy-2y^2+y^2-xy=x^2-y^2
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(x+2y)(x-y)+y(y-x)=x^2-xy+2xy-2y^2+y^2-xy=x^2-y^2