2 câu trả lời
-57-(-34)-15-27-14
=-57+34-15-27-14
=(-57-27)+(34
= -1 + 1/2 - 1/5
= -1/2 - 1/5
= -7/10
-5/7 - (-3)/4 - 1/5 - 2/7 - 1/4
= -5/7 + 3/4 - 1/5 - 2/7 - 1/4
= (-5/7 - 2/7) + (3/4 - 1/4) - 1/5
= -7/7 + 2/4 - 1/5
= -1 + 1/2 - 1/5
= -10/10 + 5/10 - 2/10
= -7/10