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

Toán Lớp 7: 2 phần 9 × 3 phần 4 – 11 phần 9 × 0,75

Tháng Tư 24, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 2 phần 9 × 3 phần 4 – 11 phần 9 × 0,75

Comments ( 2 )

  1. quynhthanhnhu
    quynhthanhnhu
    24 Tháng Tư, 2022 at 7:06 chiều
    Reply
    ĐÓ NHOA <3
     

    toan-lop-7-2-phan-9-3-phan-4-11-phan-9-0-75

  2. chauhoangmy98
    chauhoangmy98
    24 Tháng Tư, 2022 at 7:06 chiều
    Reply
    $\text{ Cách 1 : }$
    $\dfrac{2}{9}$ × $\dfrac{3}{4}$ $-$ $\dfrac{11}{9}$ × $0,75$
    $=$ $\dfrac{2 × 3}{9 × 4}$ $-$ $\dfrac{11}{9}$ × $\dfrac{3}{4}$
    $=$ $\dfrac{2 × 3}{3 × 3 × 2 × 2}$ $-$ $\dfrac{11 × 3}{9 × 4}$
    $=$ $\dfrac{1}{6}$ $-$ $\dfrac{11 × 3}{3 × 3 × 4}$
    $=$ $\dfrac{2}{12}$ $-$ $\dfrac{11}{12}$
    $=$ $\dfrac{-9}{12}$
    $=$ $\dfrac{-3}{4}$
    $\text{ Cách 2 : }$
    $\dfrac{2}{9}$ × $\dfrac{3}{4}$ $-$ $\dfrac{11}{9}$ × $0,75$
    $=$ $\dfrac{2}{9}$ × $\dfrac{3}{4}$ $-$ $\dfrac{11}{9}$ × $\dfrac{3}{4}$
    $=$ $\dfrac{3}{4}$ × ( $\dfrac{2}{9}$ $-$ $\dfrac{11}{9}$ )
    $=$ $\dfrac{3}{4}$ × ( $-1$ )
    $=$ $\dfrac{-3}{4}$

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

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