1) а) 3ax-x²=
б) аb²+5a²b=
в) 2c⁴-4c³+2c=
г) b(b-3)-4(b-3)=
д) 2ac+2c+ab+b=

2) 12a²b²+6a²b³+12ab³=
3) bc+b²-3c-3b при b=3,7, c=-4,7
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