Question

BAI 2 CHUNG TO 

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

2, (a + b ) -( b-a0 + c =2a+c

3, -(a+b -c) + (a-b-c )=-2b

4,a nhan ( b+ c) -a nhan (b+d) =a (c-d)

5,a nhan (b -c) =a (d +c )= a nhan ( b +d)

Answer 1

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

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

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

\(=0+0-b\)

\(=0-b\)

\(=-b\)

Answer 2

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

= a - b + c - a -  c

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

= 0 - b + 0 = -b

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

= a + b - b + a + c

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

= 2a + 0 + c = 2a + c

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

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

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

= 0 - 2b + 0 = -2b

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

= ab + ac - ab - ad

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

= 0 + a(c - d) = a(c - d)

5) tự lm

Answer 3

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

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

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

\(=2a+0+c\)

\(=2a+c\)

Answer 4

lam cho mk bai tim x biet voi nha

Answer 5

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

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

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

\(=0+\left(-2b\right)+0\)

\(=-2b\)

Answer 6

giup mk lam bai tim x di