Question

ПОМОГИТЕ СРОЧНО!!!!
а) (8-2/5)×1 1/4;
б) (3 1/3-1/9)×3;
в) (9-3/4)×1 1/3;
г) (2 1/5-1/15)×15​

Answer 1

Пошаговое объяснение:

а)

1) 8 - 2/5 = 7 5/5 - 2/5 = 7 3/5

2) 7 3/5 * 1 1/4 = 48/5 * 5/4 = 48/4 = 12

б)

1) (3 1/3 - 1/9) = 3 3/9 - 1/9 = 3 2/9

2) 3 2/9 * 3 = 29/9 * 3 = 29/3 * 1 = 29/3 = 9 2/3

в)

1) 9 - 3/4 = 8 4/4 - 3/4 = 8 1/4

2) 8 1/4 * 1 1/3 = 33/4 * 4/3 = 33/3 = 11

г)

1) 2 1/5 - 1/15 = 2 3/15 - 1/15 = 2 2/15

2) 2 2/15 * 15 = 32/15 * 15 = 32/1 * 1 = 32/1 = 32

Answer 2

а)

$(8 - \frac{2}{5} ) \times 1 \frac{1}{4} = (7 \frac{5}{5} - \frac{2}{5} ) \times \frac{5}{4} = 7 \frac{3}{5} \times \frac{5}{4} = \frac{38 \times 5}{5 \times 4} =\\= \frac{19}{2} = 9.5$

б)

$(3 \frac{1}{3} - \frac{1}{9} ) \times 3 = (3 \frac{3}{9} - \frac{1}{9} ) \times 3 = 3 \frac{2}{9} \times 3 = \frac{20 \times 3}{9} =\\= \frac{20}{3} = 6 \frac{2}{3}$

в)

$(9 - \frac{3}{4} ) \times 1 \frac{1}{3} = (8 \frac{4}{4} - \frac{3}{4} ) \times \frac{4}{3} = 8 \frac{1}{4} \times \frac{4}{3} = \frac{33 \times 4}{4 \times 3} = 11$

г)

$(2 \frac{1}{5} - \frac{1}{15} ) \times 15 = (2 \frac{3}{15} - \frac{1}{15} ) \times 5 = 2 \frac{2}{15} \times 15 = \\= \frac{32 \times 15}{15} = 32$