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Помогите пожалуйста !!!...

ZlataAnkvitc 1.
$1 \times \frac{1}{8} + \frac{3}{7} = 1 \times \frac{7}{56} + \frac{24}{56} = 1 \times \frac{31}{56}$
$1 \times \frac{31}{56} - \frac{47}{56} = \frac{87}{56} - \frac{47}{56} = \frac{40}{56} = \frac{5}{7}$
2.
$1 \times \frac{1}{5} + \frac{2}{9} = 1 \times \frac{9}{45} + \frac{10}{45} = 1 \times \frac{19}{45}$
$1 \times \frac{19}{45} - \frac{34}{45} = \frac{64}{45} - \frac{34}{45} = \frac{30}{45} = \frac{2}{3}$

2 votes Thanks 3

elena20092

1) 1 1/8 + 3/7 - 47/56 = 9/8 + 3/7 - 47/56 = 63/56 + 24/56 - 47/56 = 40/56 = 5/7

2) 1 1/5 + 2/9 - 34/45 = 6/5 + 2/9 - 34/45 = 54/45 + 10/45 - 34/45 = 30/45 = 2/3

2 votes Thanks 2

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