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

Toán Lớp 7: -(2/11 – 3/13) – (-3/13 – 9/11)

Toán Lớp 7: -(2/11 – 3/13) – (-3/13 – 9/11)

Comments ( 2 )

  1. Answer
    -(2/11 – 3/13) – (-3/13 – 9/11)
    = -2/11 + 3/13 + 3/13 + 9/11
    = (-2/11 + 9/11) + (3/13 + 3/13)
    = {-2+9}/11 + {3+3}/13
    = 7/11 + 6/13
    = 157/143
     

  2. -(2/(11)-3/(13))-(-3/(13)-9/(11))
    =-2/(11)+3/(13)+3/(13)+9/(11)
    =(-2/(11)+9/(11))+(3/(13)+3/(13))
    =7/(11)+6/(13)
    =(91)/(143)+(66)/(143)
    =(157)/(143)

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

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