Question

пж главные мозги помогите
$1) 3 \frac{1}{30} - 5 \frac{7}{90} \\ 2 ) 2\frac{2}{3 } + 5 \frac{5}{12} \\ 3) \frac{5}{7} + \frac{3}{8} - \frac{4}{2} \\ 4) \frac{2}{5} - \frac{4}{7} + 6 \frac{1}{2}$
​

Answer 1

Пошаговое объяснение:

3 1/30 - 5 7/90 = 3 3/90 - 5 7/90 = 2 4/90

2 2/3 + 5 5/12 = 2 8/12 + 5 5/12 = 7 13/12 = 8 1/12

5/7 + 3/8 - 4/2 = 40/56 + 21/56 - 2 = 61/56 - 2 = 1 5/56 - 1 56/56 = 51/56

2/5 - 4/7 + 6 1/2 = 28/70 - 40/70 + 6 35/70 = -12/70 + 6 35/70 = 6 23/70