Question

обчисли зручним способом. Срочноооо​

Answer 1

$- 14.9 \times 2 \frac{1}{7} + 3 \frac{1}{6} \times ( - 14 .9) + 5 \frac{13}{42} \times 13.9 = - 14.9 \times (2 \frac{1}{7} + 3 \frac{1}{6} )+ 5 \frac{13}{42} \times 13.9 = - 14.9 \times (2 \frac{6}{42} + 3 \frac{7}{42} )+ 5 \frac{13}{42} \times 13.9 = - 14.9 \times 5 \frac{13}{42} + 5 \frac{13}{42} \times 13.9 = 5 \frac{13}{42} \times( 13.9 - 14.9) = 5 \frac{13}{42} \times ( - 1) = - 5 \frac{13}{42}$