问题补充:
去括号:(1)a+(b-c+d)=______;??(2)a-2(b+c-d)=______.
答案:
解:(1)a+(b-c+d)=a+b-c+d.
(2)a-2(b+c-d)=a-2b-2c+2d.
故
时间:2020-02-07 16:21:04
去括号:(1)a+(b-c+d)=______;??(2)a-2(b+c-d)=______.
解:(1)a+(b-c+d)=a+b-c+d.
(2)a-2(b+c-d)=a-2b-2c+2d.
故
a-(b+c-d)=A.a-b+c-dB.a+b-c+dC.a-b-c+d
2023-12-22