Question

tính sau khi bỏ ngoặc:(a - b +c -d)- (a - b -c +d )

Answer 1

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

=a-b+c-d-a+b+c-d=2c

Answer 2

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

=a-b+c-d-a+b+c-d

=2c

Answer 3

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

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

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

=\(2c-2d\)

Answer 4

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

= a - b + c - d - a + b + c - d 

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

= 2c

Answer 5

\(\left(a-b+c-d\right)-\left(a-b-c+d\right)\)
\(=a-b+c-d-a+b+c-d\)
\(=\left(a-a\right)-\left(b-b\right)+\left(c+c\right)-\left(d+d\right)\)
\(=2c-2d\)

Answer 6

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

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

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

\(=2c-2d\)