(x+2y)(x+3y)+(x-2y)的二次方+(x-3y)的二次方
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(x+2y)(x+3y)+(x-2y)的二次方+(x-3y)的二次方
(x+2y)(x+3y)+(x-2y)的二次方+(x-3y)的二次方
(x+2y)(x+3y)+(x-2y)的二次方+(x-3y)的二次方
(x+2y)(x+3y)+(x-2y)^2+(x-3y)^2
=x^2+5xy+6y^2 +x^2-4xy+4y^2 +x^2-6xy+9y^2
=3x^2-5xy+19y^2
过程:原式=(x2+3xy+2xy+6y2)+(x2+4y2-4xy)+(x2+9y2-6xy)
=3x2-5xy+19y2
(过程中数字在后表示几次方,在前表数字)
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