1) =4х-х²+8-2х=-х²+4х+8
2) =у²+5у-5у-25=у²-25
3) =2а²-4а+8а-16=2а²+4а-16
4) =-8в+4в²+12-6в=4в²-14в+12
5) =25в²-30в-10в+12=25в²-40в+12
6) =5у+у²-10-2у=у²+3у-10
7) у²-4у+4у+16=у²+16
8) =х²-6х+2х-12=х²-4х-12
9) =-9а+3а²+6-2а=3а²-11а+6
10) =8х-12х²-2+3х=-12х²+11х-2
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Answers & Comments
1) =4х-х²+8-2х=-х²+4х+8
2) =у²+5у-5у-25=у²-25
3) =2а²-4а+8а-16=2а²+4а-16
4) =-8в+4в²+12-6в=4в²-14в+12
5) =25в²-30в-10в+12=25в²-40в+12
6) =5у+у²-10-2у=у²+3у-10
7) у²-4у+4у+16=у²+16
8) =х²-6х+2х-12=х²-4х-12
9) =-9а+3а²+6-2а=3а²-11а+6
10) =8х-12х²-2+3х=-12х²+11х-2