1) сократите дробь 5x^2/5x^4-x^2

2) сократите дробь 4x-8x^2/4x^5

3) разложите на множители x^2y^2+4x^2-4y^2-16

4) разложите на множители x^2y^2+4y^2-yx^2-4y

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