Question

1 4/7 * (- 5/7) - (-1 2/13) * 4 1/3 =?
2.8
2.7
2.6
2.5
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Answer 1

Переводим смешанные дроби в неправильные:

$\frac{11}{7} * (-\frac{5}{7}) - (-1\frac{2}{13})* 4\frac{1}{3} = 3\frac{43}{49}$

1) $\frac{11}{7} * (-\frac{5}{7}) = -\frac{55}{49}$

2) $-\frac{15}{13} * \frac{13}{3} = -\frac{5}{1} = -5$

3) $-\frac{55}{49} + 4\frac{49}{49} = -\frac{55}{49} + \frac{245}{49} = \frac{190}{49} = 3\frac{43}{49}$