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

Toán Lớp 7: B=2x^3-1/3x^2-[x-1/4] với x=1/2

Home/ Toán Lớp 7: B=2x^3-1/3x^2-[x-1/4] với x=1/2

Toán Lớp 7: B=2x^3-1/3x^2-[x-1/4] với x=1/2

Tháng Sáu 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: B=2x^3-1/3x^2-[x-1/4] với x=1/2

Comments ( 2 )

  1. doanthulan
    doanthulan
    2 Tháng Sáu, 2022 at 4:32 chiều
    Reply
    B = 2x^3 – 1/3x^2 – | x – 1/4 |
    – Thay x = 1/2 ta có:
    B = 2 × (1/2)^3 – 1/3 × (1/2)^2 – | 1/2 – 1/4 |
    = 2 × (1^3)/(2^3) – 1/3 × (1^2)/(2^2) – |1/4|
    = 2 × 1/8 – 1/3 × 1/4 – 1/4
    = 1/4 – 1/12 – 1/4
    = 1/6 – 1/4
    = -1/12
    => B = -1/12
    @ Rin

  2. hothaibinh
    hothaibinh
    2 Tháng Sáu, 2022 at 4:31 chiều
    Reply
    Answer
    B = 2x^{3} – 1/3x^{2} – |x – 1/4|
    B = 2 . (1/2)^{3} – 1/3 . (1/2)^{2} – |1/2 – 1/4|
    B = 2 . 1/8 – 1/3 . 1/4 – |1/4|
    B = 2 . 1/8 – 1/3 . 1/4 – 1/4
    B = 1/4 – 1/3 . 1/4 – 1/4
    B = 1/4 – 1/12 – 1/4
    B = 1/4 – 1/4 – 1/12
    B = 0 – 1/12
    B = -1/12
    $\text{Vậy}$ B = -1/12

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

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