Решите пожалуйста))по действиям. Created by Kirikova. algebra-ru

Решите пожалуйста))по действиям...

НИГЕРР 1) 7/9 * 9/7 -3,72 +8=1-3,72+8=9-3,72=5,28
2)5/3 :5 +0,175 *20/7=1/3 + 7/40 * 20/7=1/3+1/2=5/6

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julyap $1. \\ \frac{7}{9} *1 \frac{2}{7} -3.72+8=5.28\\ \\ 1) \frac{7}{9} *1 \frac{2}{7} = \frac{7}{9} * \frac{9}{7} = \frac{7*9}{9*7} =1 \\ 2)1-3.72=-2.72 \\ 3)-2.72+8=8-2.72=5.28 \\$

$2. \\ 1)1 \frac{2}{3} :5+0.175* \frac{20}{7}= \frac{5}{6} \\ 1)1 \frac{2}{3} :5= \frac{5}{3} * \frac{1}{5} = \frac{5}{3*5} = \frac{1}{3} \\ 0.175 = \frac{175}{1000} = \frac{35}{200} = \frac{7}{40} \\ 2) \frac{7}{40} * \frac{20}{7} = \frac{7*20}{40*7} = \frac{1}{2} \\ 3) \frac{1}{3} + \frac{1}{2} = \frac{2}{6} + \frac{3}{6} = \frac{5}{6}$

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