Question

Обчислити найбiльш зручним способом: 3 13/17*2 1/5- 2 1/5*2 13/17+4/5

Answer 1

$3 \frac{13}{17} \times 2 \frac{1}{5} - 2 \frac{1}{5} \times 2 \frac{13}{17} + \frac{4}{5} = 2 \frac{1}{5} \times (3 \frac{13}{17} - 2 \frac{13}{17} ) + \frac{4}{5} = 2 \frac{1}{5} \times 1 + \frac{4}{5} = \frac{11}{5} + \frac{4}{5} = \frac{15}{5} = 3$