去括号,合并同类项(x-3y)-(2x-y+2);(3a-2b)-(2a+3b)
问题描述:
去括号,合并同类项(x-3y)-(2x-y+2);(3a-2b)-(2a+3b)
答
(x-3y)-(2x-y+2)
=x-3y-2x+y-2
=-x-2y-2
(3a-2b)-(2a+3b)
=3a-2b-2a-3b
=a-5b