Bo dâu ngoac roi thuc hiên phép tính a, (18+29)+(158-18-29) b, (-13-135-49)-(13+49) c, (9436-(-42))+(-9436-28-42) d, (-53+29-15)-(-53-34-15)

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1. Đáp án:

   `a, (18+29)+(158-18-29) = 158`

   `b, (-13-135-49)-(13+49) = -169`

   `c, (9436-(-42))+(-9436-28-42) = -28`

   `d, (-53+29-15)-(-53-34-15) = 63`

   Giải thích các bước giải:

   a, `(18+29)+(158-18-29)`

   `= 18 + 29 + 158 – 18 – 29`

   `= (18 – 18) + (29-29) + 158`

   `= 0 + 0 + 158`

   `= 158`

   `b, (-13-135-49)-(13+49)`

   `= -13-135-19 – 13 – 49`

   `= (-13-13) + (-19-49) – 135`

   `= -26 – 8- 135`

   `= -169`

   `c, (9436-(-42))+(-9436-28-42)`

   `= 9436 + 42 – 9436 – 28 – 42`

   `= (9436 – 9436) + (42-42) – 28`

   `= 0 + 0 -28`

   `= -28`

   `d, (-53+29-15)-(-53-34-15)`

   = $-53$ $+$ $29$ $-$ $15$ $+$ $53$ $+$ $34$ $+$ $15$

   `= (-53+53) + (-15+15) + 29 + 34`

   `= 0 +0 + 63`

   `= 63`

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2. `18+29+158-18-29`

   `= (18-18) + (29-29) + 158`

   `= 0+0+158`

   `= 158`

   `(-13-135-49)-(13+49)`

   `= -13-135-49-13-49`

   `= -13 . 2 – 49 . 2 – 135`

   `= -26 – 98 – 135`

   `= -259`

   `(9436-(-42))+(-9436-28-42)`

   `= 9436+42-9436-28-42`

   `= (9436-9436) + (42-42) – 28`

   `= 0+0-28`

   `= -28`

   `(-53+29-15)-(-53-34-15)`

   `= -53+29-15+53+34+15`

   `= (53-53) + (15-15) + 29 + 34`

   `= 0+0+29+34`

   `= 63`

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