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

Toán Lớp 6: 5.[x + (-15)] – 20 = -30 – (- 105) chú ý 5. ko phải là bài 5 ;-;

Toán Lớp 6: 5.[x + (-15)] – 20 = -30 – (- 105)
chú ý 5. ko phải là bài 5 ;-;

Comments ( 2 )

  1. 5*[x+(-15)]-20=-30-(-105)
    5*(x-15)-20=-30+105
    5*(x-15)-20=75
    5*(x-15)=75+20
    5*(x-15)=95
    x-15=95:5
    x-15=19
    x=19+15
    x=34

  2. Lời giải chi tiết:
    5.[x+(-15)]-20=-30-(-105)
    =>5.[x+(-15)]-20=75
    =>5.[x+(-15)]=75+20
    =>5.[x+(-15)]=95
    =>x+(-15)=95:5
    =>x+(-15)=19
    =>x=19-(-15)
    =>x=34
    Vậy x=34

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

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