a-(b-c+d)去括号 -(2x-y)+(2-z)去括号 4a-2(b-3c)去括号 -5a+1/2(4x-6)去括号 2(a-b)-3(c+d
问题描述:
a-(b-c+d)去括号 -(2x-y)+(2-z)去括号 4a-2(b-3c)去括号 -5a+1/2(4x-6)去括号 2(a-b)-3(c+d
-2/5(m-n)+1/3(p-q)去括号
急需!快~3三分钟内.
答
a-(b-c+d)=a-b+c-d
-(2x-y)+(2-z)=-2x+y+2-z
4a-2(b-3c)=4a-2b+6c
-5a+1/2(4x-6)=-5a+2x-3
2(a-b)-3(c+d)=2a-2b-3c-3d