№1Разложите на множители:
а)x²-25;
б)ab²-ac²;
в)-3a²-6ab-3b²;

№2
Найдите значение выражения: xy-x
²-2y+2x при x=[tex]2 \frac{2}{3} [/tex],y=[tex]3 \frac{2}{3} [/tex] 
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