Question

Вычислите. 2) 1 3/4 : 25 + 0,4 × 1,9 =
3) 6,25 × 1/5 + 4/5 : 0,64 =
4) 38 - 15 × 0,6 : 1/4 =
5) 1 3/5 × 0,5 + 0,16 × 1 1/4 =
6) 9,1 + 11 1/2 : 5 - 5,6 =

Answer 1

Пошаговое объяснение:

$2) \: \: \: \frac{13}{4 } \div 25 +0.4 \times 1.9 = 0.89 \\ \frac{13 \times 1}{4 \times 25} = \frac{13}{100} = 0.13 \\ 0.4 \times 1.9 = 0.76 \\ 0.13 + 0.76 = 0.89 \\$

$3) \: \: \: 6.25 \times \frac{1}{5} + \frac{4}{5} \div 0.64 = \\ 6 \frac{1}{4} \times \frac{1}{5} = \frac{25}{4} \times \frac{1}{5} = \frac{25}{20} = 1 \frac{1}{4} \\ \frac{4}{5} \div 0.64 = \frac{4 \times 100}{5 \times 64} = \frac{25}{16} \\ 1 \frac{1}{4} + 1 \frac{9}{16} = 2 \frac{4 + 9}{16} = 2 \frac{13}{16}$