HELP ME: a)7/19.8/11+7/19.3/11+12/19 b)17/13.18/23-4/13.18/23- -5/23 c)5/7.-4/19+-15/7.5/19

Question

HELP ME:
a)7/19.8/11+7/19.3/11+12/19
b)17/13.18/23-4/13.18/23- -5/23
c)5/7.-4/19+-15/7.5/19

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Skylar 3 tuần 2021-08-23T06:07:25+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-23T06:08:45+00:00

    Đáp án:

     

    Giải thích các bước giải:

    `7/19. 8/11+7/19. 3/11+12/19`

    `= 7/19. (8/11 + 3/11) + 12/19`

    `= 7/19. 1 + 12/19`

    `= 7/19 + 12/19`

    `=1`

    `17/13. 18/23 – 4/13. 18/23- (-5)/23`

    `= 18/23. (17/13 – 4/13) + 5/23`

    `= 18/23. 1 + 5/23`

    `= 18/23 + 5/23`

    `=1`

    `5/7. -4/19+ -15/7. 5/19`

    `= -20/133 + -75/133`

    `= -5/7`

    0
    2021-08-23T06:09:17+00:00

    Đáp án:

    a) `1`

    b) `1`

    c) `-5/7`

    Giải thích các bước giải:

    a) `7/19 . 8/11+7/19 . 3/11+12/19`

    `= 7/19 . (8/11 + 3/11) + 12/19`

    `= 7/19 . 1 + 12/19`

    `= 7/19 + 12/19 = 1`

    b) `17/13 . 18/23 – 4/13 . 18/23- (-5)/23`

    `= 18/23 . ( 17/13 – 4/13 ) + 5/23`

    `= 18/23 . 1 + 5/23`

    `= 18/23 + 5/23 = 1`

    c) `5/7 . (-4/19) + (-15/7) . 5/19`

    `= 5/7 . (-4/19) + 5/7 . (-3) . 5/19`

    `= 5/7 . [ (-4/19) + (-3) . 5/19 ]`

    `= 5/7 . (-1) = -5/7`

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