来自吕新荣的问题
先去括号,再合并同类项正确的是()A.2x-3(2x-y)=-4x-yB.5x-(-2x+y)=7x+yC.5x-(x-2y)=4x+2yD.3x-2(x+3y)=x-y
先去括号,再合并同类项正确的是()
A.2x-3(2x-y)=-4x-y
B.5x-(-2x+y)=7x+y
C.5x-(x-2y)=4x+2y
D.3x-2(x+3y)=x-y
1回答
2019-12-30 17:39