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

Toán Lớp 7: Tính nhanh : `A = 1/3 – 3/4 – ( -3/5 ) + 1/72 – 2/9 – 1/36 + 1/15`

Tháng Chín 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tính nhanh :
A = 1/3 – 3/4 – ( -3/5 ) + 1/72 – 2/9 – 1/36 + 1/15

Comments ( 2 )

  1. catlantuong
    catlantuong
    23 Tháng Chín, 2022 at 1:35 sáng
    Reply
    A = 1/3 – 3/4 – (-3/5) + 1/72 – 2/9 – 1/36 + 1/15
    A = 1/3 – 3/4 + 3/5 + 1/72 – 2/9 – 1/36 + 1/15
    A = (1/3 + 3/5 + 1/15) – (3/4 – 1/72 + 2/9 + 1/36)
    A = 1 – 71/72
    A = 1/72
    $\text{#Apples}$

  2. hienchaudiem
    hienchaudiem
    23 Tháng Chín, 2022 at 1:35 sáng
    Reply
    A = 1/3 – 3/4 – (-3/5) + 1/72 – 2/9 – 1/36 + 1/15
    = 1/3 – 3/4 + 3/5 + 1/72 – 2/9 – 1/36 + 1/15
    = ( 1/3 + 3/5 + 1/15) – ( 3/4 – 1/72 + 2/9 + 1/36)
    = (5/15 + 9/15 + 1/15) – ( 54/72 – 1/72 + 16/72 + 2/72)
    = 1 – 71/72
    = 72/72 – 71/72
    = 1/72
    #caty09

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

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