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

Toán Lớp 5: 1/3 + 2/5 – 7/15. 3/4: 7/8 nhân 14/15

Toán Lớp 5: 1/3 + 2/5 – 7/15.
3/4: 7/8 nhân 14/15

Comments ( 2 )

  1. 1/3 + 2/5 – 7/(15).
    = (1 xx 5)/(3 xx 5) + (2 xx 3)/(5 xx 3) – 7/(15)
    = 5/(15) + 6/(15) – 7/(15)
    = 4/(15)
    3/4 : 7/8 xx (14)/(15)
    = 3/4 xx 8/7 xx (14)/(15)
    = 6/7 xx (14)/(25)
    = 4/5

  2. $\frac{1}{3}$ $+$ $\frac{2}{5}$ $-$ $\frac{7}{15}$
    $=$ $\frac{5}{15}$ $+$ $\frac{6}{15}$ $-$ $\frac{7}{15}$
    $=$ $\frac{5+6-7}{15}$
    $=$ $\frac{4}{15}$
    ————————————————————————————————————–
    $\frac{3}{4}$ $÷$ $\frac{7}{8}$ $×$  $\frac{14}{15}$ 
    $=$ $\frac{3}{4}$ $×$ $\frac{8}{7}$ $×$  $\frac{14}{15}$ 
    $=$ $\frac{3×8×14}{4×7×15}$
    $=$ $\frac{336}{420}$
    $=$ $\frac{4}{5}$ 
    $Chúc$ $bạn$ $học$ $tốt!$

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

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