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х³- х²у - ху² + у³
а² - b² + a + b
xc - ус - x² + 2xу - у²
х³- х²у - ху² + у³
а² - b² + a + b
xc - ус - x² + 2xу - у²
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1) x²(x-y)-y²(x-y)=(x-y)(x²-y²)=(x-y)(x-y)(x+y)2) (a-b)(a+b)+1*(a+b)=(a+b)(a-b+1)
3) c(x-y)-1*(x²-2xy+y²)= c(x-y)-1*(x-y)²=(x-y)(c-1*(x-y))=(x-y)(c-x+y)