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

Toán Lớp 7: 5/9 : ( 1/11- 5/22) + 5/9 : (1/15- 2/3)

Toán Lớp 7: 5/9 : ( 1/11- 5/22) + 5/9 : (1/15- 2/3)

Comments ( 2 )

  1. 5/9 : ( 1/11- 5/22) + 5/9 : (1/15- 2/3)
    = 5/9 : (2/22 – 5/22) + 5/9 : (1/15- 10/15)
    = 5/9 : -3/22 + 5/9 : {-3}/5
    = 5/9 . {-22}/3 + 5/9 . {-5}/3
    = 5/9 . (-22/3 + {-5}/3)
    = 5/9 . (-9)
    = -5

  2. 5/9 : (1/11 – 5/22) + 5/9 : (1/15 – 2/3)
    = 5/9 : -3/22 + 5/9 : -3/5
    = -100/27 + -25/27
    = -125/27

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