Ответ:
64а²-48а+9
16а²+56ab+49b²
4x²+6xy-6xy-9у²=4х²-9у²
25х²-20х+4
4-16х+16²
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Ответ:
64а²-48а+9
16а²+56ab+49b²
4x²+6xy-6xy-9у²=4х²-9у²
25х²-20х+4
4-16х+16²