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

Toán Lớp 4: Các bạn oi! 5/15+3/5=? 6/9-1/3=? 12/9×3/8=? 10÷7/4=?

Toán Lớp 4: Các bạn oi!
5/15+3/5=?
6/9-1/3=?
12/9×3/8=?
10÷7/4=?

Comments ( 2 )

  1. 5/15 + 3/5 = 5/15 + (3 × 3)/(5 × 3) = 5/15 + 9/15 = 14/15
    6/9 – 1/3 = 6/9 – (1×3)/(3 × 3) = 6/9 – 3/9 = 1/3
    12/9 × 3/8 = (12 × 3/9×8) = (3 × 1)/(3 × 2) = 1/2 (dùng phương pháp khử)
    10 ÷ 7/4 = 10 × 4/7 = (10 × 4)/7 = 40/7

  2. Giải đáp + Lời giải và giải thích chi tiết:
    5/15 + 3/5 = 3/5 = 9/15 + 5/15 = 14/15 .
    6/9 – 1/3 = 1/3 = 3/9 ; 6/9 – 3/9 = 3/9 = 1/3 .
    12/9 × 3/8 = 12 × 3/9 × 8 = 36/72
    10 : 7/4 = 10 × 4/7 =  40/7 .

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

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