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