27x(13×5)+18x(59+14) tính nhanh

Question

27x(13×5)+18x(59+14) tính nhanh

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Hưng Gia 4 years 2020-11-01T14:46:32+00:00 2 Answers 82 views 0

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  1. Giakhanh
    0
    2020-11-01T14:48:14+00:00
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    ` 27 × (13 × 5) + 18 × (59 + 14) `

    ` = 27 × 13 × 5 + 18 × 59 + 18 × 14 – 675 `

    ` = 135 × 18 + 18 × 59 + 18 × 14 – 675 `

    ` = 18 × (135 + 59 + 14) – 675 `

    ` = 18 × 208 – 675 `

    ` = 18 × 200 + 144 – 675 `

    ` = 3600 + 144 – 675 `

    ` = 3069 `

  2. minhkhoi
    0
    2020-11-01T14:48:23+00:00
    Reply

    Đáp án:

    Bạn tham khảo nha

    $27$ × ($13$ × $5$) + $18$ × ($59$ + $14$)

    = $27$ × $65$ + $18$ × $73$

    = $1755$ + $1314$

    = $3069$

                            chúc bạn học tốt nha ^^

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )