thực hiện phép tính ( 1 cách hợp lí nếu có thể ) a , 27 . 97 – 27 . 17 + 80 . 73 b , ( – 33 ) + 36 + ( – 39 ) + 42 + ( – 45 ) + 48 c , ( 3^15 . 27 –

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thực hiện phép tính ( 1 cách hợp lí nếu có thể )
a , 27 . 97 – 27 . 17 + 80 . 73
b , ( – 33 ) + 36 + ( – 39 ) + 42 + ( – 45 ) + 48
c , ( 3^15 . 27 – 2^15 . 2 ) : 3^18
d , – 2989 + [ 989 – ( 297 : 3^2 + 2^2 . 3^3 )]

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Gianna 3 tuần 2021-11-19T10:07:20+00:00 2 Answers 3 views 0

Answers ( )

    0
    2021-11-19T10:08:41+00:00

    `27 . 97 – 27 . 17 + 80 . 73`

    `=27.(97-27)+80.73`

    `=27.80+80.73`

    `=80.(27+73)`

     `=80.100`

    `=8000`

    `( – 33 ) + 36 + ( – 39 ) + 42 + ( – 45 ) + 48`

    `=(36-33)+(42-39)+(48-45)`

    `=3+3+3`

    `=9`

    `( 3^15 . 27 – 2^15 . 2 ) : 3^18`

    `=(2^18-2^16):3^18`

    `=1-2^16:3^18`

    `=1-(2^16)/(3^18)`

    `- 2989 + [ 989 – ( 297 : 3^2 + 2^2 . 3^3 )]`

    `=- 2989 + [989 – ( 33 + 108 )`

    `=-2000-141`

    `=-2141`

    0
    2021-11-19T10:09:18+00:00

    `a)27 . 97 – 27 . 17 + 80 . 73`

    `=27.(97-17)+80.73`

    `=27.80+80.73`

    `=80.(27+73)`

    `=80.100`

    `=8000`

    `b)( – 33 ) + 36 + ( – 39 ) + 42 + ( – 45 ) + 48`

    `=[(-33)+36]+[(-39)+42]+[(-45)+48]`

    `=3+3+3`

    `=9`

    `c)( 3^15 . 27 – 2^15 . 2 ) : 3^18`

    `=(3^15 . 3^3 – 2^16):3^18`

    `=(3^18-2^16):3^18`

    `=3^18:3^18-2^16:3^18`

    `=1-2^16:3^18`

    (Kết quả tạm thời để vậy)

    `d)- 2989 + [ 989 – ( 297 : 3^2 + 2^2 . 3^3 )]`

    `=-2989+[989-(33+108)]`

    `=-2989+[989-141]`

    `=-2989+989-141`

    `=-2000-141`

    `=-2141`

     

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