26. Выполните действия: » (12-1.8), 4) (3, 4 -2)-7 2) (6-4%):2,2; 5) (2.1 +0,25)...

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26. Выполните действия: » (12-1.8), 4) (3, 4 -2)-7 2) (6-4%):2,2; 5) (2.1 +0,25)-0,12 ; 3) (1,25+) 2.4; 6) (716--22:19 10

заранее спасибо :>

Answers & Comments

SirWallon

Пошаговое объяснение:

1).

$(1 \frac{3}{5} + 1.8) \times \frac{1}{2} = (1 \frac{3}{5} + 1\frac{4}{5} ) \times \frac{1}{2} = 3 \frac{2}{5} \times \frac{1}{2} = \frac{17}{5} \times \frac{1}{2} = \frac{17}{10} = 1.7$

2).

$(6 - 4 \frac{8}{15} ) \div 2.2 = 1 \frac{7}{15} \div 2 \frac{1}{5} = \frac{22}{15} \div \frac{11}{5} = \frac{22}{15} \times \frac{5}{11} = \frac{2}{3}$

3).

$(1.25 + \frac{1}{6} ) \times 2.4 = (1 \frac{1}{4} + \frac{1}{6}) \times 2.4 = (1 \frac{3}{12} + \frac{2}{12}) \times 2.4 = 1 \frac{5}{12} \times 2.4 = \frac{17}{12} \times \frac{12}{5} = \frac{17}{5} = 3 \frac{2}{5}$

4).

$(5.4 - 2 \frac{1}{3}) \div 7 \frac{2}{3} = (5 \frac{2}{5} - 2 \frac{1}{3}) \div 7 \frac{2}{3} = (5 \frac{6}{15} - 2 \frac{5}{15}) \div 7 \frac{2}{3} = 3 \frac{1}{15} \div \div 7 \frac{2}{3} = \frac{46}{15} \div \frac{23}{3} = \frac{46}{15} \times \frac{3}{23} = \frac{2}{5}$

5).

$(2 \frac{1}{3} + 0.25) \times 0.12 = (2 \frac{1}{3} + \frac{1}{4}) \times 0.12 = (2 \frac{4}{12} + \frac{3}{12}) \times 0.12 = 2 \frac{7}{12} \times 0.12 = \frac{31}{12} \times \frac{12}{100} = \frac{31}{100} = 0.31$

6).

$(7.6 - 4 \frac{3}{4}) \div 1.9 = (7 \frac{3}{5} - 4 \frac{3}{4}) \div 1.9 = (7 \frac{12}{20} - 4 \frac{15}{20}) \div 1.9 = 2 \frac{17}{20} \div 1.9 = \frac{57}{20} \div \frac{19}{10} = \frac{57}{20} \times \frac{10}{19} = \frac{3}{2} = 1.5$