先去括号,再合并同类项(1)(x-2y)-(y-2x)+(-3x+y) (2)(a-b+c)-(b-c+a)
问题描述:
先去括号,再合并同类项(1)(x-2y)-(y-2x)+(-3x+y) (2)(a-b+c)-(b-c+a)
答
1.原式=X-2Y-Y+2X-3X+Y 2.原式=a-b+c-b+c-a
=-2Y =-2b+2c