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

Toán Lớp 7: (2/9)-(-1/121)+(-3/5)+(-1/2)-(-1/13/18)-1/7-9/35

Toán Lớp 7: (2/9)-(-1/121)+(-3/5)+(-1/2)-(-1/13/18)-1/7-9/35

Comments ( 2 )

  1. (2/9) – (-1/121) + (-3/5) + (-1/2) – (-1 13/18) – 1/7 – 9/35
    = 2/9 + 1/121 – 3/5 – 1/2 + 31/18 – 1/7 – 9/35
    = ( 2/9 +31/18 – 1/2) – (3/5 + 1/7 + 9/35) + 1/121
    = ( 4/18 + 31/18 – 9/18) – ( 21/35+ 5/35 + 9/35) + 1/121
    = 13/9 – 1 + 1/121
    = 4/9 + 1/121
    = 493/1089

  2. Giải đáp:
    (493)/(1089)
    Lời giải và giải thích chi tiết:
    (2)/(9)-(-(1)/(121))+(-3)/(5)+(-1)/(2)-(-1 (13)/(18))-(1)/(7)-(9)/(35)
    =((2)/(9)-(1)/(2)+1 (13)/(18))+((-3)/(5)-(1)/(7)-(9)/(35))-(-1)/(121)
    =(4-9+31)/(9*2)-(21+5+9)/(5*7)+(1)/(121)
    =(26)/(9*2)-(35)/(35)+(1)/(121)
    =(13)/(9)-1+(1)/(121)
    =(1573-1089+9)/(9*121)
    =(493)/(1089)

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

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