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

Toán Lớp 6: 3 1/9.12 5/7-9 5/7.3 1/9 3,2.15/64-(4/5+2/3):3 2/3

Toán Lớp 6: 3 1/9.12 5/7-9 5/7.3 1/9
3,2.15/64-(4/5+2/3):3 2/3

Comments ( 2 )

  1. 3  1/9 .12  5/7-9  5/7. 3  1/9
    =3 1/9. (12 5/7-9 5/7)
    =3 1/9. 3
    =28/3
    —————
    3,2. 15/64-(4/5+2/3):3  2/3
    =16/5. 15/64-22/15:11/3
    =3/4-2/5
    =7/20

  2. a) 3(1)/(9).12(5)/(7)-9(5)/(7).3(1)/(9)
    =(28)/(9).(89)/(7)-(68)/(7).((28)/(9)
    =(28)/(9).((89)/(7)-(68)/(7))
    =(28)/(9).3
    =(28)/(3)
    b) 3,2.(15)/(64)-(4/5+2/3):3(2)/(3)
    =3/4-(22)/(15):(11)/(3)
    =3/4-4/5-2/5
    =3/4-2/5
    =7/(20)
    =-(51)/(220)
     

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

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