Question

-1/2∙(-4/5) -2целое 3/5∙(-10/39) 0,5∙(-6/7)

Answer 1

Ответ:

-1/2×(-4/5)=2/5

второе не совсем понятно, между -2 и 3/5 какой знак?

0.5×(-6/7)=1/2 ×(-6/7)= - 3/7

Answer 2

Let's simplify each of the expressions step by step:

1. $-\frac{1}{2} \cdot \left(-\frac{4}{5}\right)$: Multiply the fractions: $\frac{1}{2} \cdot \frac{4}{5} = \frac{4}{10} = \frac{2}{5}$ Since the sign is negative, the result is: $-\frac{2}{5}$

2. $-2 \frac{3}{5} \cdot \left(-\frac{10}{39}\right)$: Convert the mixed number to an improper fraction: $2 \frac{3}{5} = \frac{2 \cdot 5 + 3}{5} = \frac{13}{5}$ Multiply the fractions: $\frac{13}{5} \cdot \frac{10}{39} = \frac{130}{195}$ Simplify the fraction: $\frac{130}{195} = \frac{2 \cdot 65}{3 \cdot 65} = \frac{2}{3}$ Since the sign is negative, the result is: $-\frac{2}{3}$

3. $0.5 \cdot \left(-\frac{6}{7}\right)$: Convert the decimal to a fraction: $0.5 = \frac{1}{2}$ Multiply the fractions: $\frac{1}{2} \cdot \frac{6}{7} = \frac{6}{14} = \frac{3}{7}$ Since the sign is negative, the result is: $-\frac{3}{7}$

So, the results of the expressions are:

1. $-\frac{1}{2} \cdot \left(-\frac{4}{5}\right) = -\frac{2}{5}$
2. $-2 \frac{3}{5} \cdot \left(-\frac{10}{39}\right) = -\frac{2}{3}$
3. $0.5 \cdot \left(-\frac{6}{7}\right) = -\frac{3}{7}$