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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: 4/3×7 + 4/7×11 + 4/11×15 + 4/15×19+…+4/23×2

Home/ Toán Lớp 5: 4/3×7 + 4/7×11 + 4/11×15 + 4/15×19+…+4/23×2

Toán Lớp 5: 4/3×7 + 4/7×11 + 4/11×15 + 4/15×19+…+4/23×2

Tháng Sáu 10, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: 4/3×7 + 4/7×11 + 4/11×15 + 4/15×19+…+4/23×2

Comments ( 2 )

  1. ngocle44
    ngocle44
    10 Tháng Sáu, 2022 at 9:43 sáng
    Reply
    Answer
    4/{3xx7} + 4/{7xx11} + … + 4/{23xx27}
    = 1/3 – 1/7 + 1/7 – 1/11 + … + 1/23 – 1/27
    = 1/3 – 1/27
    = 8/27
     

  2. thucquyenlan
    thucquyenlan
    10 Tháng Sáu, 2022 at 9:43 sáng
    Reply
    $\dfrac{4}{3×7}$+$\dfrac{4}{7×11}$+$\dfrac{4}{11×15}$+$\dfrac{4}{15×19}$+…+$\dfrac{4}{23×27}$
    =$\dfrac{1}{3}$-$\dfrac{1}{7}$+$\dfrac{1}{7}$-$\dfrac{1}{11}$+…..+$\dfrac{1}{23}$-$\dfrac{1}{27}$
    =$\dfrac{1}{3}$-$\dfrac{1}{27}$
    =$\dfrac{8}{27}$

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222-9+11+12:2*14+14 = ? ( )

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