Đề bài: Thực hiện phép tính , -12/25 : 7/8 + -9/8 .12/25 – 1/25

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Đề bài: Thực hiện phép tính , -12/25 : 7/8 + -9/8 .12/25 – 1/25

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Ivy 2 tháng 2021-10-04T06:28:16+00:00 2 Answers 15 views 0

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    0
    2021-10-04T06:29:52+00:00

    $\frac{-12}{25}$ : $\frac{7}{8}$ + $\frac{-9}{8}$ . $\frac{12}{25}$  – $\frac{1}{25}$ 

    = $\frac{-12}{25}$ . $\frac{8}{7}$ + $\frac{9}{8}$ . $\frac{-12}{25}$  – $\frac{1}{25}$ 

    = $\frac{-12}{25}$ . ( $\frac{8}{7}$ + $\frac{9}{8}$ ) – $\frac{1}{25}$ 

    = $\frac{-12}{25}$ . ( $\frac{64}{56}$ + $\frac{63}{56}$ ) – $\frac{1}{25}$ 

    = $\frac{12}{25}$ . $\frac{127}{56}$ – $\frac{1}{25}$ 

    = $\frac{254}{575}$ – $\frac{1}{25}$

    = $\frac{254}{575}$ – $\frac{23}{575}$

    = $\frac{231}{575}$ 

    HỌC TỐT NHA !

    #NOCOPY 

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    0
    2021-10-04T06:29:59+00:00

    $\text { Đáp án: }$

    ` –12/25 : 7/8 + (–9/8) . 12/25 – 1/25 `

    ` = –12/25 . 8/7 + 9/8 . (–12/25) – 1/25 `

    ` = –12/25 . ( 9/8 + 8/7 ) – 1/25 `

    ` = –12/25 . 127/56 – 1/25 `

    ` = 254/575 – 1/25 `

    ` = 231/575 `

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