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

Toán Lớp 7: 16`3/5`.`-1/3`-13`3/5`.`-1/3`+`3/4` 7,2+(-3,7+2,8)-0,3 (1`1/2`-0,5):`(-3)^2`+`1/3`-`1/6`

Toán Lớp 7: 163/5.-1/3-133/5.-1/3+3/4
7,2+(-3,7+2,8)-0,3
(11/2-0,5):(-3)^2+1/3-1/6

Comments ( 1 )

  1. a, 16 3/5. (-1)/3 – 13 3/5. (-1)/3 + 3/4
    = (-1)/3. (16 3/5 – 13 3/5) + 3/4
    = (-1)/3. [(16 – 13) + (3/5 – 3/5)] + 3/4
    = (-1)/3. 3 + 3/4
    = -1 + 3/4
    = -1/4
    b, 7,2 + (-3,7 + 2,8) – 0,3
    = 7,2 – 3,7 + 2,8 – 0,3
    = (7,2 + 2,8) – (3,7 + 0,3)
    = 10 – 4
    = 6
    c, (1 1/2 – 0,5) : (-3)^2 + 1/3 – 1/6
    = (3/2 – 1/2) : 9 + 1/3 – 1/6
    = 1 : 9 + 1/3 – 1/6
    = 1/9 + 1/3 – 1/6
    = 5/18

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