thực hiện phép tính a) 1/2 . ( 2/9 + 3/7 – 5/27 ) b) 1/3 . 5/7 – 7/27 . 36/14

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thực hiện phép tính
a) 1/2 . ( 2/9 + 3/7 – 5/27 )
b) 1/3 . 5/7 – 7/27 . 36/14

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Remi 3 tuần 2021-07-09T22:39:00+00:00 2 Answers 2 views 0

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    0
    2021-07-09T22:40:07+00:00

    `a,`

    `1/2 . (2/9 + 3/7 – 5/27)`

    `= 1/2 . (41/63 – 5/27)`

    `= 1/2 . 88/189`

    `= (1.88)/(2.189)`

    `= 244/189`

    `b,`

    `1/3 . 5/7 – 7/27 . 36/14`

    `= 5/21 – 2/3`

    `= 5/21 – 14/21`

    `= (5 – 14)/21`

    `= (-3)/7`

    0
    2021-07-09T22:40:14+00:00

    `a)` `1/2` `.` `( 2/9 + 3/7 – 5/27 )`

    `1/2` `.` `( 42/189 + 81/189 – 35/189 )`

    `1/2` `.` `88/189`

    `88/378`

    `44/189`

    `b)` `1/3` `.` `5/7`  `-` `7/27` `.` `36/14`

    `5/21` `-` `7/27` `.` `18/7`

    `5/21` `-` `126/189`

    `45/189` `-`  `126/189`

    `-3/7`

    $#UMR#$

     

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