розкласти на множники
a+b+a²-b²
9a²-6ab+b²-16
x³y-x³-xy²+x
1-x²+4xy-4y²
a+b+a²-b²
9a²-6ab+b²-16
x³y-x³-xy²+x
1-x²+4xy-4y²
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