Объяснение:
26) 1) (3n+5m)/mn
2) (4y-3)/xy
3) (28-39)/36ab=-11/36ab
4) (72txy+80kx-105y)/60x²y²
5) (2n²-5mn-6n²-5m²)/mn=(-4n²-5mn-5m²)/mn
6) (6x²-3x+2-3xy-x²y+4y)/xy²=(6x²-x²y-3xy-3x+4y+2)/xy²
27) 2) (5a²+10a-15-3a²+9a-6)/(15a²-30a+15)=(2a²+19a-21)/(15a²-30a+15)
