(x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的

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(x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的
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(x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的
(x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的

(x+3y)(x-y)-(x+y)^2 =x²-xy+3xy-3y²-x²-y²-2xy =-4y² 那个2xy怎么算的
(x+3y)(x-y)
=x(x-y)+3y(x-y)
=x²-xy+3xy-3y²
=x²+2xy-3y²

(x+3y)(x-y)-(x+y)^2
=(x²-xy+3xy-3y²)-(x²+y²+2xy)
=x²-xy+3xy-3y²-x²-y²-2xy
=-4y²

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