合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)

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合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)(3x^

合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)
合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)

合并同类项:(3x^2-2xy+7)-(-4X^2+5xy+6)
(3x^2-2xy+7)-(-4X^2+5xy+6)
=3x^2-2xy+7+4X^2-5xy-6
=7x^2-7xy+1

(3x^2-2xy+7)-(-4X^2+5xy+6)
=3x²-2xy+7+4x²-5xy-6
=(3x²+4x²)-(2xy+5xy)+(7-6)
=7x²-7xy+1

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