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a²b+3ab²-ab
__________ =
4c
1 a²b+3ab²-ab
__ _____________ = 1/2 *12=6
2 2c
b)
2a²b+6ab²-2ab
____________ =
c
2 (a²b+3ab²-ab)/c=2 *2(a²b+3ab²-ab)/2c=4*12=48
c)
3ab-3a²b-9ab²
____________= -3(a²b+3ab²-ab)/4c= -3*6 =-18
4c
(a²b+3ab²-ab)/4c=6 (z pkt pierwszego)