tolong pr nya ya kaka....untuk besok.

1a) (-3m + 4n - 6) + (7n - 8m + 10)
= - 3m - 8m + 4n + 7n - 6 + 10
= - 11m + 11n + 4

b) (15a + 7b - 5c) + (-11a - 12b + 13d)
= 15a - 11a + 7b - 12b - 5c + 13d
= 4a - 5b - 5c + 13d

2a) (-3m + 4n - b) - (7n - 8m + 10)
= - 3m + 8m + 4n - 7n - b - 10
= 5m - 3n - b - 10

b) (-11a - 12b + 13d) - (15a + 7b - 5c)
= - 11a - 15a - 12b - 7b + 13d + 5c
= - 26a - 19b + 5c + 13d

1. a) -3m +4n-6 +( 7n-8m+10)
       = 7n+4n-8m-3m+10-6
       = 11n-11m+4
    b) 15a + 7b - 5c + (-11a-12b+13d)
       = 15a-11a+7b-12b-5c+13d
       = 4a-5b-5v+13d

2 a) -3m + 4n - b + (- 7n - 8m + 10)
       = -3m-8m+4n-7n-b+10
       = -11m -3n-b+10

   b) = 15a+7b-5c-(-11a-12b+13d)
       = 15a+7b-5c+11a-12b+13d
       = 15a+11a+7b-12b-5c+13d
       = 26a-5b-5c+13d