Question

3,2 * (-0,7) 4/9 * (-2/5) (-2/7):(2/9) 0,7 * (-2,8) -3/4 * 16/21 (-7/9) : (-14/45)

Answer 1

3,2 * (-0,7) = -2,24

4/9 * (-2/5) = 4*(-2)/9*5 = -8/45

(-2/7) : (2/9) = - 2*9/7*2 = -9/7= 1 2/7(ну одна целая две седьмых)

0,7* (-2,8) = -1,98

-3/4 * 16/21 = -3*16/4*21 = -4/7

(-7/9) : (-14/45) = 7*45/9*14 = 5/2 = 2 1/2 ( ну две целых одна вторая)

Answer 2

Let's solve these mathematical expressions step by step:

1. $3.2 \times (-0.7)$ Result: $-2.24$

2. $\frac{4}{9} \times \left(-\frac{2}{5}\right)$ Result: $-\frac{8}{45}$

3. $-\frac{2}{7} : \frac{2}{9}$ When dividing fractions, you multiply by the reciprocal of the second fraction: Result: $-\frac{9}{7} \times \frac{9}{2} = -\frac{81}{14}$

4. $0.7 \times (-2.8)$ Result: $-1.96$

5. $-\frac{3}{4} \times \frac{16}{21}$ Result: $-\frac{12}{28} = -\frac{3}{7}$

6. $-\frac{7}{9} : \left(-\frac{14}{45}\right)$ When dividing fractions, you multiply by the reciprocal of the second fraction: Result: $-\frac{7}{9} \times \left(-\frac{45}{14}\right) = \frac{35}{18}$

So, the results of the given expressions are:

1. $3.2 \times (-0.7) = -2.24$
2. $\frac{4}{9} \times \left(-\frac{2}{5}\right) = -\frac{8}{45}$
3. $-\frac{2}{7} : \frac{2}{9} = -\frac{81}{14}$
4. $0.7 \times (-2.8) = -1.96$
5. $-\frac{3}{4} \times \frac{16}{21} = -\frac{3}{7}$
6. $-\frac{7}{9} : \left(-\frac{14}{45}\right) = \frac{35}{18}$