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

Toán Lớp 9: `(1+4/1.5).(1+4/2.6).(1+4/3.7)-.(1+4/20.24)`

Toán Lớp 9: (1+4/1.5).(1+4/2.6).(1+4/3.7)…..(1+4/20.24)

Comments ( 1 )

  1. Giải đáp + giải thích các bước giải:
    (1+4/(1.5))(1+4/(2.6))(1+4/(3.7))…(1+4/(20.24))
    =9/(1.5) . 16/(2.6) . 25/(3.7) . … . 484/(20.24)
    =(3^2 . 4^2 . 5^2 . … . 22^2)/(1.5.2.6.3.7. … . 20.24)
    =((3.4.5. … . 22).(3.4.5. … .22))/((1.2.3.4.5. … . 20).(5.6.7. … .8.9.24))
    =(3.4.5. … . 22)/(1.2.3.4.5. … . 20).(3.4.5. … .22)/(5.6.7. … .8.9.24)
    =(21. 22)/(1.2) . (3.4)/(23.24)
    =21.11 . 1/(23.2)
    =231/46

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