Розложить на 1) 4m²-9n²+2m+3m; 2) 5x²y-5xy²-x²+y²

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 1) 4m²-9n²+2m+3m=(4m²-9n²)+(2m+3m)=(2m+3m)(2m-3m)+(2m+3m)=
(2m+3m)[(2m-3m)-1]

2) 5x²y-5xy²-x²+y²=(5x²y-5xy²)-(x²-y²)= 5y(x²-y²)-(x²-y²)=(x²-y²)(5y-1)