1)9а³-а(3а+2)²+4а(3а+7),при а=-1 1/6
2)(2y-5)²-(y-3)²-4y,при y= -2/7
3)25m(m-1)-(5m-3)²-6m,при m= -0,3
4)24x²-(7x-2)²+(5x-3)(5x+1),при x= -5/9

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