Question

решить три примера на фотке, срочно​

Answer 1

1)

$1.5 \times (1 \frac{2}{3} + 1 \frac{1}{2} ) +(2 \frac{3}{4} - 1.25) \times (2 \frac{1}{3} - 1.5) = 3.5 \\ 1) \: 1 \frac{2}{3} + 1 \frac{1}{2} = 1 \frac{4}{6} + 1 \frac{3}{6} = 2 \frac{7}{6} = 3 \frac{1}{6} \\ 2) \: 1.5 \times 3 \frac{1}{6} = \frac{3 \times 19}{2 \times 6} = \frac{19}{4} = 4 \frac{3}{4} = 4.75 \\ 3) \: 2 \frac{3}{4} - 1.25 = 2 \frac{3}{4} - 1 \frac{1}{4} = 1 \frac{2}{4} = 1 \frac{1}{2} \\ 4) \: 2 \frac{1}{3} - 1.5 = 2 \frac{1}{3} - 1 \frac{1}{2} = 2 \frac{2}{6} - 1 \frac{3}{6} = 1 \frac{8}{6} - 1 \frac{3}{6} = \frac{5}{6} \\ 5) \: 1 \frac{1}{2} \times \frac{5}{6} = \frac{3 \times 5}{2 \times 6} = \frac{5}{4} = 1 \frac{1}{4} = 1.25 \\ 6) \: 4.75 - 1.25 = 3.5$

2)

$1.8 \times (2 \frac{3}{4} + 1 \frac{1}{3} ) + (2 \frac{3}{4} - 0.95) \times (3 \frac{1}{4} - 2 \frac{1}{3} ) =9 \\ 1) \: 2 \frac{3}{4} + 1 \frac{1}{3} = 2\frac{9}{12} + 1 \frac{4}{12} = 3 \frac{13}{12} = 4 \frac{1}{12} \\ 2) \: 1.8 \times 4 \frac{1}{12} = \frac{9 \times 49}{5 \times 12} = \frac{147}{20} = 7 \frac{7}{20} = 7.35 \\ 3) \: 2 \frac{3}{4} - 0.95 = 2.75 - 0.95 = 1.8 \\ 4) \: 3 \frac{1}{4} - 2 \frac{1}{3} = 3 \frac{3}{12} - 2 \frac{4}{12} = 2 \frac{15}{12} - 2 \frac{4}{12} = \frac{11}{12} \\ 5) \: 1.8 \times \frac{11}{12} = \frac{9 \times 11}{5 \times 12} = \frac{33}{20} = 1 \frac{13}{20} = 1.65 \\ 6) \: 7.35 + 1.65 = 9$

3)

$(2.8 \div 1 \frac{2}{5} + 3 \frac{1}{5} \times 1 \frac{7}{8} ) \times 10 = 80\\ 1) \: 2.8 \div 1 \frac{2}{5} = \frac{14 \times 5}{5 \times 7} = 2 \\ 2) \: 3 \frac{1}{5} \times 1 \frac{7}{8} = \frac{16 \times 15}{5 \times 8} = 6 \\ 3) \: 2 + 6 = 8 \\ 4) \: 8 \times 10 = 80$