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

Toán Lớp 6: Giúp e với ạ. Tính nhanh. 3/28+12/35+2/15-7/12

Toán Lớp 6: Giúp e với ạ. Tính nhanh.
3/28+12/35+2/15-7/12

Comments ( 2 )

  1. 3/28 + 12/35 + 2/15 – 7/12
    = (3/28 + 12/35) + (2/15 – 7/12)
    = (15/140 + 48/140) + (8/60 – 35/60)
    = 63/140 + (-27/60)
    = 9/20 + (-9/20)
    = 0

  2. Giải đáp:
    $\frac{3}{28}$ + $\frac{12}{35}$ + $\frac{2}{15}$ – $\frac{7}{12}$
    = ($\frac{3}{28}$ – $\frac{7}{12}$) + ($\frac{12}{35}$ + $\frac{2}{15}$)
    =  ($\frac{36}{336}$ + $\frac{196}{336}$) +($\frac{180}{525}$ + $\frac{70}{525}$) 
    = – $\frac{10}{21}$ + $\frac{10}{21}$ 
    = 0

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

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