去括号:①-5a-二分之一(4x-6)= ②-(x-y)+7(m+1)=

问题描述:

去括号:①-5a-二分之一(4x-6)= ②-(x-y)+7(m+1)=

-5a-二分之一(4x-6)
= -5a -(2x-3)
= -5a-2x+3
-(x-y)+7(m+1)
=-x+y+7m+7

①-5a-二分之一(4x-6)
=-5a-2a+3
②-(x-y)+7(m+1)
=-x+y+7m+7