Đáp án:
$\dfrac{10}{42}$ $+$ $\dfrac{-3}{28}$ $+$ $\dfrac{-55}{132}$
$=$ $\dfrac{5}{21}$ $+$ $\dfrac{-3}{28}$ $+$ $\dfrac{-5}{12}$
$=$ $\dfrac{5.4}{21.4}$ $+$ $\dfrac{-3.3}{28.3}$ $+$ $\dfrac{-5.7}{12.7}$
$=$ $\dfrac{20+(-9)+(-35)}{84}$
$=$ $\dfrac{-24}{84}$
$=$ $\dfrac{-2}{7}$
Ta có: 10/42; -3/28; -55/132
Vì:
$-3/28 < 0 => -9/84<0 $
$-55/132 < 0 => -35/84<0$
$10/42 > 0 $
Vì: $-9/84 > -35/84 $
$=> -3/28 > -55/132$
Vậy thứ tự từ bé đến lớn là: $-55/132; -3/28; 10/42$
BẠN THAM KHẢO NHA!!!
