Question

Cho a,b,c,d thuộc Z. Áp dụng quy tắc dấu ngoặc viết gọn biểu thức sau:

A=(a+b)+(c-d)-(a+b)-(b-d)

Answer 1

\(A=\left(a+b\right)+\left(c-d\right)-\left(a+b\right)-\left(b-d\right)\)

\(=a+b+c-d-a-b-b+d\)

\(=c-b\)

Answer 2

A=(a+b)+(c-d)-(a-b)-(b+d)

 cho xin k bạn ơi

Answer 3

                                                              Bài giải

Ta có :

\(A=\left(a+b\right)+\left(c-d\right)-\left(a+b\right)-\left(b-d\right)\)

\(A=a+b+c-d-a-b-b+d\)

\(A=c-b\)

Answer 4

\(A=\left(a+b\right)+\left(c-d\right)-\left(a+b\right)-\left(b-d\right)\)

\(A=a+b+c-d-a-b-b+d\)

\(A=c-b\)

Answer 5

\(A=\left(a+b\right)+\left(c-d\right)-\left(a+b\right)-\left(b-d\right)\)

\(=\left[\left(a+b\right)-\left(a+b\right)\right]+c-d-b+d=c-b\)