1.4a+16ab+16b²=4(a+4ab+4b²) 1.4a²+16ab+16b²=4(a²+4ab+4b²)=4(a+2b)²2.25a²-80a+64=(5a-8)² 3.3x³-6x²y+3xy²=3x(x²-2xy+y²)=3x(x-y)
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