Question

помогите пожалуйста
458номер​

Answer 1

1.

$x - 2 \frac{7}{12} - 5 \frac{3}{18} \\ x = 2 \frac{7}{12} + 5 \frac{3}{18} = 7 + \frac{7}{12} + \frac{3}{18} = \\ = 7 \frac{3 \times 7 + 2 \times 3}{36} = \\ = 7 \frac{21 + 6}{36} = 7 \frac{27}{36} = 7 \frac{3}{4}$

2.

$x - 26 \frac{7}{21} = 100 \frac{5}{28} \\ x = 100 \frac{5}{28} + 26 \frac{7}{21} = 126 + \frac{5}{28} + \frac{7}{21} = \\ = 126 \frac{3 \times 5 + 4 \times 7}{84} = 126 \frac{15 + 28}{84} = \\ = 126 \frac{43}{84}$

3.

$x - 37 \frac{17}{54} = 15 \frac{16}{45} \\ x = 15 \frac{16}{45} + 37 \frac{17}{54} = 52 + \frac{16}{45} + \frac{17}{54} = \\ = 52 \frac{6 \times 16 + 5 \times 17}{270} = 52 \frac{96 + 85}{270} = \\ = 52 \frac{181}{270}$

4.

$x - 33 \frac{21}{25} = 42 \frac{17}{35} \\ x = 42 \frac{17}{35} + 33 \frac{21}{25} = 75 + \frac{17}{35} + \frac{21}{25} = \\ = 75 \frac{5 \times 17 + 7 \times 21}{175} = 75 \frac{85 + 147}{175} = \\ = 75 \frac{232}{175} = 76 \frac{57}{175}$