№4. Упростите выражение и найдите его значение:
1)(а-7х)/а:(ах-7х^2)/а^2 при а = 3, х = -9 ,
2) (3ас^2)/(а^2-16с^2 )⋅(а-4с)/ас при а=2,1 с=-0,4,
3) (8в – 8)(8в + 8) – 8в(8в + 8) при в = 1,6

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