Đáp án:
Giải thích các bước giải:
$\frac{1}{15}$ + $\frac{9}{10}$ + $\frac{14}{15}$ - $\frac{1}{9}$ - $\frac{20}{10}$ + $\frac{1}{157}$
= ( $\frac{1}{15}$ + $\frac{14}{15}$ ) + ( $\frac{9}{10}$ - $\frac{20}{10}$ ) - $\frac{1}{9}$ + $\frac{1}{157}$
= 1 - $\frac{11}{10}$ + $\frac{9}{1413}$ - $\frac{157}{1413}$
= - $\frac{1}{10}$ - $\frac{148}{1413}$
= - $\frac{1413}{14130}$ - $\frac{1480}{14130}$
= - $\frac{2963}{14130}$
