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b)8x-4y-6
d)2a-6b-11
e)12a-10b+12
b. ( 6x - 4y) - ( -2x + 6 ) =6x-4y+2x-6=8x-4y-6
d. ( - 3a - 12b - 7 ) + ( 5a + 6b - 4 ) =-3a-12b-7+5a+6b-4=2a-6b-11
e. ( 5a - 11b + 4 ) + ( 7a + 8b ) - ( 7b - 8 ) =5a-11b+4+7a+8b-7b+8=12a-10b+12
a. (5a - 7) + (3a - 9) = 5a - 7 + 3a -9 = 8a - 16
b. (6x - 4y) - (-2x + 6) = 6x - 4y + 2x - 6 = 8x - 4y - 6
d. (-3a - 12b - 7) + (5a + 6b - 4) = -3a - 12b - 7 + 5a + 6b - 4 = 2a - 6b - 11
e. (5a - 11b + 4) + (7a + 8b) - (7b - 8) = 5a - 11b + 4 + 7a + 8b - 7b + 8 =
12 a - 10b + 12
mam nadzieję, że dobrze. ;D