15 + 37) + (52 – 37 – 17) b/ (38 – 42 + 14) – (25 – 27 – 15) c/ –(21 – 32) – (–12 + 32) d/ –(12 + 21 – 23) – (23 – 21 + 10) e/ (57 – 725) – (605

0 bình luận về “15 + 37) + (52 – 37 – 17) b/ (38 – 42 + 14) – (25 – 27 – 15) c/ –(21 – 32) – (–12 + 32) d/ –(12 + 21 – 23) – (23 – 21 + 10) e/ (57 – 725) – (605”

1. Bài làm :

   a, `(15+37)+(52-37-17)`

   `=15+37+52-37-17`

   `=(37-37)+52+15-17`

   `=0+52+15-17`

   `=67-17`

   `=50`

   b, `(38-42+14)-(25-27-15)`

   `=38-42+14-25+27+15`

   `=-4+14-25+27+15`

   `=10-25+27+15`

   `=-15+27+15`

   `=(-15+15)+27`

   `=0+27`

   `=27`

   c, `-(21-32)-(-12+32)`

   `=-21+32+12-32`

   `=(32-32)+(-21+12)`

   `=0+(-9)`

   `=-9`

   d, `-(12+21-23)-(23-21+10)`

   `=-12-21+23-23+21-10`

   `=(-21+21)+(23-23)+(-12-10)`

   `=0+0+(-22)`

   `=-22`

   e, `(57-725)-(605-53)`

   `=57-725-605+53`

   `=(57+53)+(-725-605)`

   `=110+(-1330)`

   `=110-1330`

   `=-1220`

   f, `(55+45+15)-(15-55+45)`

   `=55+45+15-15+55-45`

   `=(55+55)+(45-45)+(15-15)`

   `=110+0+0`

   `=110`

   Bình luận

2. a. (15 + 37) + (52 – 37 – 17)

       = 15 + 37 + 52 – 37 – 17

       = 50

   b. (38 – 42 + 14) – (25 – 27 – 15)

       = 38 – 42 + 14 – 25 + 27 + 15

       = 27

   c. -(21 – 32) – (-12 + 32)

       =-21+32+12-32

       =-9

   d. -(12 + 21 – 23) – (23 – 21 + 10)

       = -12 – 21 + 23 – 23 + 21 – 10

       = -22

   e. (57 – 725) – (605 – 53)

       = 57 – 725 – 605 + 53

       = -1220

   f.  (55 + 45 + 15) – (15 – 55 + 45)

       = 55 + 45 + 15 – 15 + 55 – 45

       = 110

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