(225 – 1576) – (125 – 1576 + 176) 63 – 9.(10 + 7) 45.( –69) + 31.(–45) + (–27) (–23).(–48) – 23.148 – 245 47.(27 – 15) – 27.(47 – 15) 162 (73 49) (7

0 bình luận về “(225 – 1576) – (125 – 1576 + 176) 63 – 9.(10 + 7) 45.( –69) + 31.(–45) + (–27) (–23).(–48) – 23.148 – 245 47.(27 – 15) – 27.(47 – 15) 162 (73 49) (7”

1. Đáp án:

   a)

   (225 – 1576) – (125 – 1576 + 176)

   = 225 – 1576 – 125 + 1576 – 176

   = (225 – 125) + (-1576 + 1576) – 176

   = 100 + 0 – 176

   = -76

   b)

   63 – 9.(10 + 7)

   = 63 – 90 – 63

   = -90

   c)

   45.( –69) + 31.(–45) + (–27)

   = 45 . (-69 – 31) -27

   = 45 . (-100) – 27

   = -4500 – 27

   = -4527

   d)

   (–23).(–48) – 23.148 – 245

   = (-23) . (-48 + 148) – 245

   = (-23) . 100 – 245

   = -2300 – 245

   = -2545

   e)

   47.(27 – 15) – 27.(47 – 15)

   = 47 . 27 – 47 . 15 – 27 . 47 + 27 . 15

   = (47 . 27 – 27 . 47) + 15 . (27 – 47)

   = 0 + 15 . (-20)

   = -300

   f)

   162 (73 49) (73 162) (cho chị xin lại đề)

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2.  $(225 – 1576) – (125 – 1576 + 176)$

   $= 225 – 1576 – 125 – 1576 – 176$

   $= (225 – 125) + (1576 – 1576) – 176$

   $= 100 – 176$

   $= -76$

    $63 – 9 × (10 + 7)$

   $= 63 – 90 – 63$

   $= -90$

    $45 × ( –69) + 31 × (–45) + (–27)$

   $= 45 × (-69 – 31) + (-27)$

   $= 45 × (-100) – 27$

   $= -4500 – 27$

   $= -4527$

    $(–23) × (–48) – 23 × 148 – 245$

   $= (-23) × (-48 + 148) – 245$

   $= (-23) × 100 – 245$

   $= -2300 – 245$

   $= -2545$

    $47 × (27 – 15) – 27 × (47 – 15)$

   $= 47 × 27 – 47 × 15 – 27 × 47 + 27 × 15$

   $= ( 47 × 27 – 27 × 47) + 15 × (27 – 47)$

   $= 0 + 15 × (-20)$

   $= -300$

    $62 – (73 – 49) + (73 – 162)$

   $= 62 – 73 + 49 + 73 – 162$

   $= (62 – 162) + [(-73) + 73] + 49$

   $= (-100) + 0 + 49$

   $= (-100) + 49$

   $= -51$

    

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