Question

thu gọn biểu thức sau: (a+b-c)+(a-b+c)-(a-b-c)

 

Answer 1

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

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

\(=a+b+c\)

Answer 2

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

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

= a + b + 3c

Answer 3

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

Answer 4

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

Answer 5

(a+b−c)+(a−b+c)−(a−b−c)

=a+b−c+a−b+c−a+b+c

=a+b+c

Answer 6

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

Answer 7

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

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

\(=a+b+c\)

Answer 8

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

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

= a + b + c

Answer 9

{a+b-c}+{a-b+c}-{ a-b-c}

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

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

= a.3-b.3+c.3

=3{a-b+c}

Answer 10

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

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

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

\(=a+b+c\)