a) ( -28 ) + ( -35 ) – 92 ( -82 ) b) 15 – ( -38 ) + ( -55 ) – ( +47 ) c) 21 – 22 + 23 -24

2 bình luận về “a) ( -28 ) + ( -35 ) – 92 ( -82 ) b) 15 – ( -38 ) + ( -55 ) – ( +47 ) c) 21 – 22 + 23 -24”

1. a) (-28) + (-35) – 92 + (-82)

   = -63 – 92 – 82

   = -155 – 82

   = -237

   b) 15 – (-38) + (-55) – (+47)

   = 15 + 38 – 55 – 47

   = 53 – 55 – 47

   = -2 – 47

   = -49

   c) 21 – 22 + 23 – 24

   = -1 + 23 -24

   = 22 – 24

   = -2

    

   Trả lời
2. a) (-28) + (-35) – 92 + (-82)

   = -63 – 92 – 82

   = -155 – 82

   = -237

   b) 15 – (-38) + (-55) – (+47)

   = 15 + 38 – 55 – 47

   = 53 – 55 – 47

   = -2 – 47

   = -49

   c) 21 – 22 + 23 – 24

   = -1 + 23 -24

   = 22 – 24

   = -2

   Trả lời