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

Toán Lớp 7: 23$\frac{1}{4}$ . $\frac{7}{5}$ – 13$\frac{1}{4}$ : $\frac{5}{7}$

Toán Lớp 7: 23$\frac{1}{4}$ . $\frac{7}{5}$ – 13$\frac{1}{4}$ : $\frac{5}{7}$

Comments ( 2 )

  1. Giải đáp:
    14 
    Lời giải và giải thích chi tiết:
    23 1/4 . 7/5 – 13 1/4 : 5/7
    = 23 1/4 . 7/5 – 13 1/4 . 7/5
    = 7/5 . (23 1/4 – 13 1/4)
    = 7/5 . [(23 + 1/4) – (13 + 1/4)]
    = 7/5 . (23 + 1/4 – 13 – 1/4)
    =7/5 . [(23 – 13) + (1/4 – 1/4)]
    = 7/5 . 10
    = 14

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

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