Представьте в виде произведения:
1) (х-у)^2 - (m+n)^2
2) (2a-3c)^2 - (4b+5a)^2
3) 4(a-b)^2 - (a+b)^2
4) 9(a-b)^2 - 4(x-y)^2
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