-9/20×(-18/25) решите п лс28/63÷(-9/7). Created by belozerovandrey06. matematika-ru

7)...

ubolhovitina 1) -9/20 • -18/25 = 81/250 или 0,324
2) 28/63 = 4/9
4/9 : (-9/7) = - 28/81

2 votes Thanks 2

michindjeva $- \frac{9}{20} \times ( - \frac{18}{25} ) = \frac{9 \times 18}{20 \times 25} = \\ \frac{9 \times 9}{10 \times 25} = \frac{81}{250}$
$\frac{28}{63} \div ( - \frac{9}{7} ) = - \frac{28 \times 7}{63 \times 9} = \\ - \frac{28}{9 \times 9} = - \frac{28}{81}$

3 votes Thanks 2

ubolhovitina 28/63, а не 23/63

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