Giải đáp: 1) \frac{1}{2}+(-\frac{2}{5})-(-\frac{2}{3}) =\frac{1}{2}-\frac{2}{5}+\frac{2}{3} =\frac{15}{30}-\frac{12}{30}+\frac{20}{30} =\frac{23}{30} 2) \frac{5}{3}-\frac{3}{4}+\frac{7}{6} =\frac{20}{12}-\frac{9}{12}+\frac{14}{12} =\frac{20-9+14}{12} =\frac{25}{12} @CH_{3}SO_{3}H Trả lời
2 bình luận về “1,1/2+-2/5–2/3 2,5/3-3/4+7/6”