Question

-4/7*7/9= -9 3/5*(-10/21)= Очень срочно

Answer 1

Если например: 4/7 читается как четыре седьмых, а не четыре разделить на семь, то...

-4/7*7/9=-4/9

Если 9 3/5 читается как девять целых три пятых, то...

-9 3/5*(-10/21)=-48/5*(-10/21)=32/7=4 4/7

Answer 2

Вот ответ!
Всё тут подробно написано✔️

Answer 3

Let's solve these expressions:

1. $-\frac{4}{7} \times \frac{7}{9}$

   The multiplication of the numerators and denominators is as follows:

   $-\frac{4 \times 7}{7 \times 9} = -\frac{28}{63}$

   This fraction can be simplified by dividing both the numerator and denominator by their greatest common factor, which is 7:

   $-\frac{28}{63} = -\frac{4}{9}$

2. $-\frac{9}{5} \times \left(-\frac{10}{21}\right)$

   Multiply the numerators and denominators:

   $\frac{9 \times 10}{5 \times 21} = \frac{90}{105}$

   Simplify the fraction by dividing both the numerator and denominator by their greatest common factor, which is 15:

   $\frac{90}{105} = \frac{6}{7}$

So, the results are:

1. $-\frac{4}{7} \times \frac{7}{9} = -\frac{4}{9}$
2. $-\frac{9}{5} \times \left(-\frac{10}{21}\right) = \frac{6}{7}$

If you meant something different by "Очень срочно" (which translates to "Very urgently" in Russian), please provide more context or clarification.