Автор - SeeYouSoonn

СРОЧНО!!! БАЛЛЫ!!!
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Под номером 2 и 3

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Автор - Universalka

2)frac{x^{2}-4x+4y-y^{2}}{x^{2}-y^{2}}=frac{(x^{2}-y^{2})-(4x-4y)}{x^{2}-y^{2}}=frac{(x-y)(x+y)-4(x-y)}{x^{2}-y^{2}}=frac{(x-y)(x+y-4)}{(x-y)(x+y)} =frac{x+y-4}{x+y}=1-frac{4}{x+y}

3)frac{b^{2}-2b+1-c^{2}}{b^{2}-c^{2}-b+c}=frac{(b^{2}-2b+1)-c^{2}}{(b^{2}-c^{2})-(b-c)}=frac{(b-1)^{2}-c^{2}}{(b-c)(b+c)-(b-c)}=frac{(b-c-1)(b+c-1)}{(b-c)(b+c-1)}=frac{b-c-1}{b-c}=1-frac{1}{b-c}

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