Предмет: Математика, автор: rgermogenova

Помогите пожалуйста х+21/х2-9-х/х+3

Ответы

Автор ответа: litanalove

x² -9 =(x -3)(x +3)

(x +21 -x(x -3)) /(x -3)(x +3) =(x +21 -x² +3x) /(x -3)(x +3) =(4x -x² +21) /(x -3)(x +3) =(7 -x)(x +3) /(x -3)(x +3) =(7 -x) /(x -3)

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