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

Toán Lớp 5: giải giúp e ạ a)3/4+ 5/6 b)5/9×6/7 c)12/7:28/21

Toán Lớp 5: giải giúp e ạ
a)3/4+ 5/6
b)5/9×6/7
c)12/7:28/21

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a)3/4 + 5/6
    = 18/24 + 20/24
    = 38/24
    = 19/12
    b)5/9 xx 6/7
    = 30/63
    = 10/21
    c) 12/7 : 28/21
    = 12/7 xx 21/28
    = 252/196
    = 9/7

  2. a)$\dfrac{3}{4}$ + $\dfrac{5}{6}$ = $\dfrac{18}{24}$ + $\dfrac{20}{24}$ = $\dfrac{38}{24}$= $\dfrac{19}{12}$
    b) $\dfrac{5}{9}$ . $\dfrac{6}{7}$ = $\dfrac{5 .6}{9 .7}$ = $\dfrac{30}{63}$ = $\dfrac{10}{21}$
    c) $\dfrac{12}{7}$ : $\dfrac{28}{21}$ = $\dfrac{12}{7 }$ . $\dfrac{21}{28}$ = $\dfrac{252}{196}$ = $\dfrac{9}{7}$
      

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

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