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

Toán Lớp 6: -2/3+3/4-1/2+1/6 1/10-(-1)/12+1/15

Toán Lớp 6: -2/3+3/4-1/2+1/6
1/10-(-1)/12+1/15

Comments ( 2 )

  1. +)-2/3+3/4-1/2+1/6
    =(-2/3+1/6)+(3/4-1/2)
    =(-4/6+1/6)+(3/4-2/4)
    =-1/2+1/4
    =-2/4+1/4
    =-1/4
    +)1/10-(-1)/12+1/15
    =1/10+1/12+1/15
    =6/60+5/60+4/60
    =15/60
    =1/4

  2. a) -2/3+3/4-1/2+1/6
    =(-8)/(12)+9/(12)-(6)/(12)+(2)/(12)
    =(-8+9-6+2)/(12)
    =-3/(12)
    =-1/4
    b) 1/(10)-(-1)/(12)+1/(15)
    1/(10)+(1)/(12)+1/(15)
    =6/(60)+(5)/(60)+(4)/(60)
    =(6+5+4)/(60)
    =(15)/(60)
    =1/4
     

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