(7x+2y)+(4+3x)-(15y-7) 5(x+y)-4(3x-2y)-3(2x-3y) 等于多少 两道合并同类项

(7x+2y)+(4+3x)-(15y-7) 5(x+y)-4(3x-2y)-3(2x-3y) 等于多少 两道合并同类项 合并同类项：-3x+2y-5x-7y 3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项 3x+2y-5(x+y)合并同类项 合并同类项:- 2(x-y)的平方- 3(x-y)+5(y-x)的平方+4(y-x) 合并同类项：6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 1,5{2x-7y}-3{4x-10y} 2,{x-y}-[3x+{-x+y}] 去括号,合并同类项, (x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)
3x+2y合并同类项 2x^4y^2-3x^2y-5x^4y^2+x^2y-7xy^2 合并同类项 合并同类项：-6x²y-x+5x²y-2x+x³y+3x 合并同类项 2x^2-3x^2+4x^2 5x-2y+3x+4y