1) (а-5)2+9(а-2)
2) (а+6)2+(3а-1) (3а+1)
3) ( 1/а2-4/б2)*1/2а+б
4) а2-6аб+9б2/а2-3аб* 3а+9б/а2-9б2
5) сократить : 8x-4/2x2-11x+5
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