b)(-42).(35-16)-35.(16-42) c) (56-26).(-4)+61.(-11-19) d)(-72).(34-12)-34.(12-72)

0 bình luận về “b)(-42).(35-16)-35.(16-42) c) (56-26).(-4)+61.(-11-19) d)(-72).(34-12)-34.(12-72)”

1. b, ( -42 ) . ( 35 – 16 ) – 35 . ( 16 – 42 )

    = ( -42 ) . 35 – ( -42 ) . 16 – 35 . 16 + 35 . 42

    = ( -42 ) . 16 – 35 . 16

    = 16 . ( -42 – 35 ) 

    = 16 . ( -77 )

    = -1232

   c, ( 56 – 26 ) . ( -4 ) + 61 . ( -11 – 19 )

    = 30 . ( -4 ) + 61 . ( -30 ) 

    = 30 . ( -4 ) + ( -61 ) . 30

    = 30 . ( -4 – 61 )

    = 30 . ( -65 )

    = -1950

   d, ( -72 ) . ( 34 – 12 ) – 34 . ( 12 – 72 )

    = ( -72 ) . 34 – ( -72 ) . 12 – 34 . 12 + 34 . 72

    = ( -72 ) . 34 + 72 . 12 – 34 . 12 + 34 . 72

    = 72 . 12 – 34 . 12

    = 12 . ( 72 – 34 )

    = 12 . 38

    = 456

    

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2. a)`(-42).(35-16)-35.(16-42)`

   `(-42).(19) – 35 . (-26 )`

   `( – 42 ) .19 – (35 . – 26)`

   `( – 42 ) . 19 – (-910)`

   `(-42 . 19 ) – ( – 910 )`

   `-798 –  ( – 910 )`

   ` – 789 + 910`

   `112`

   b)`(56-26).(-4)+61.(-11-19)

   `=30 . (-4 ) – (-61 ). 30`

   `= 30 . ( -4 + – 61 ). 30`

   `= 30 . -65 . 30`

   `= -58500`

   c)`(-72).(34-12)-34.(12-72)`

   `=( – 72 ) . 22 – 34 .( – 60 )`

   `=( – 72 . 22 ) – ( 34 . – 60 )`

   `=(-1584 ) – ( 2040 )`

   `= ( – 1584 ) + 2040`

   `=2040 – 1584`

   `= 456`

   chúc bạn học tốt!! xin hay nhất ạ

    

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