Question

1170. Выполните 3 1) 7 20 3 1 7 5 1 действия: - 1,5 12 6--1,4:1,8 2) 10,75 3 21 +1,75): 15,5 5,7:0,3-8

Может Просто решение и всё.
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Answer 1

Ответ:

7 3/20-5 1/12=7 9/60-5 5/60=

=2 4/60=2 1/15

2 1/15×1.5=2 1/15×1 1/2=

=31/15×3/2=31/10

6 3/7×1.4=6 3/7×1 2/5=

=45/7×7/5=9

9÷1.8=5

31/10÷5=31/10×1/5=31/50

2)

5.7÷0.3=19

19-8 1/3=18 3/3-8 1/3=10 2/3

10 2/3×0.75=10 2/3×3/4=

=32/3×3/4=8

2 1/8+1.75=2 1/8+1 3/4=

=2 1/8+1 6/8=3 7/8

3 7/8÷15.5=3 7/8÷15 1/2=

=31/8÷31/2=31/8×2/31=1/4

8÷1/4=8×4/1=32

Answer 2

1)

$\frac{(7 \frac{3}{20} - 5 \frac{1}{12} ) \times 1.5}{6 \frac{3}{7} \times 1.4 \div 1.8 } = 0.62 \\ 1) \: \: 7 \frac{3}{20} - 5 \frac{1}{12} = 7 \frac{9}{60} - 5 \frac{5}{60} = 2 \frac{4}{60} = 2 \frac{1}{15} \\ 2) \: \: 2 \frac{1}{15} \times 1.5 = \frac{31 \times 3}{15 \times 2} = \frac{31}{10} = 3.1 \\ 3) \: \: 6 \frac{3}{7} \times 1.4 \div 1.8 = \frac{45 \times 7 \times 5}{7 \times 5 \times 9} = 5 \\ 4)3.1 \div 5 = 0.62$

2)

$\frac{(5.7 \div 0.3 - 8 \frac{1}{3} ) \times 0.75}{(2 \frac{1}{8} + 1.75) \div 15.5} = 32\\ 1) \: \: 5.7 \div 0.3 = 57 \div 3 = 19 \\ 2)19 - 8 \frac{1}{3} = 18 \frac{3}{3} - 8 \frac{1}{3} = 10 \frac{2}{3} \\ 3) \: \: 10 \frac{2}{3} \times 0.75 = \frac{32 \times 3}{3 \times 4} = 8 \\ 4) \: \: 2 \frac{1}{8} + 1.75 = 2 \frac{1}{8} + 1 \frac{3}{4} = \\ 2 \frac{1}{8} + 1 \frac{6}{8} = 3 \frac{7}{8} \\ 5) \: \: 3 \frac{7}{8} \div 15.5 = \frac{31 \times 2}{8 \times 31} = \frac{1}{4} \\ 6) \: \: 8 \div \frac{1}{4} = 8 \times 4 = 32$