合并同类项16x^2y-7(xy^2+xy-x^2+7y^2
-x^2y+5xy^2-yx^2合并同类项
合并同类项 -3x²y+2x²y+3xy²-2xy²
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
合并同类项:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
2x^4y^2-3x^2y-5x^4y^2+x^2y-7xy^2 合并同类项
-2y^3+(3xy^2-x^2y)-2(xy^2-y^3)去括号合并同类项
7x²y-2xy²+2yx²+y²x-3xy²怎么做?是合并同类项在算
合并同类项:x²y²-1/3xy²+1/2xy²+2/3x²y
合并同类项(1)2x-3x-7x(2)2xy-3xy+5xy(3)5x^3y-6x-7x^3y-8x(4)2/3x^2-
先去括号,再合并同类项:3x²y-[2xy²-2(xy-2/3x²y)+xy]+3xy
合并同类项:-3x+2y-5x-7y
x²-3xy-3x²y²+2yx²-y²x 合并同类项