Найдите значение выражения: a) 22,2:5$$\frac{2}{7}$$-2$$\frac{3}{5}$$; б) ($$\frac{1}{9}$$-8$$\frac{2}{3}$$)$$\cdot$$1$$\frac{5}{7}$$

Вариант А1 Задание 1 a) 22,2 : 5$$\frac{2}{7}$$ - 2$$\frac{3}{5}$$ = 22$$\frac{2}{10}$$ : $$\frac{37}{7}$$ - $$\frac{13}{5}$$ = 22$$\frac{1}{5}$$ : $$\frac{37}{7}$$ - $$\frac{13}{5}$$ = $$\frac{111}{5}$$ : $$\frac{37}{7}$$ - $$\frac{13}{5}$$ = $$\frac{111}{5}$$ $$\cdot$$ $$\frac{7}{37}$$ - $$\frac{13}{5}$$ = $$\frac{111 \cdot 7}{5 \cdot 37}$$ - $$\frac{13}{5}$$ =$$\frac{777}{185}$$ - $$\frac{13}{5}$$ = $$\frac{777}{185}$$ - $$\frac{13 \cdot 37}{5 \cdot 37}$$ = $$\frac{777}{185}$$ - $$\frac{481}{185}$$ = $$\frac{777-481}{185}$$ = $$\frac{296}{185}$$ = 1$$\frac{111}{185}$$ = 1$$\frac{3 \cdot 37}{5 \cdot 37}$$ = 1$$\frac{3}{5}$$. б) ($$\frac{1}{4}$$ - 8$$\frac{2}{3}$$) $$\cdot$$ 1$$\frac{5}{7}$$ = ($$\frac{1}{4}$$ - $$\frac{26}{3}$$) $$\cdot$$ $$\frac{12}{7}$$ = ($$\frac{1 \cdot 3}{4 \cdot 3}$$ - $$\frac{26 \cdot 4}{3 \cdot 4}$$) $$\cdot$$ $$\frac{12}{7}$$ = ($$\frac{3}{12}$$ - $$\frac{104}{12}$$) $$\cdot$$ $$\frac{12}{7}$$ = -$$\frac{101}{12}$$ $$\cdot$$ $$\frac{12}{7}$$ = - $$\frac{101 \cdot 12}{12 \cdot 7}$$ = -$$\frac{101}{7}$$ = -14$$\frac{3}{7}$$.

Ответ: a) 1$$\frac{3}{5}$$; б) -14$$\frac{3}{7}$$

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