Используя формулы a²+2ab+b²=(a+b)² и a²-2ab+b²=(a-b)², представьте трёхчлен в виде квадрата суммы или квадрата разности
а). x¹+2+y+y²=.....
б). (3x)²-2(3x)(4y)-(4y)²=....
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