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

Toán Lớp 6: 1: 5 – ( 9 – x ) = 15 2: – ( +8 ) + (11 – x ) = 10

Toán Lớp 6: 1: 5 – ( 9 – x ) = 15
2: – ( +8 ) + (11 – x ) = 10

Comments ( 2 )

  1. 1)5-(9-x)=15
    =>9-x=5-10
    =>9-x=-5
    =>x=9-(-5)
    =>x=14
    Vậy x=14
    2)-(+8)+(11-x)=10
    =>-8+11-x=10
    =>-8+11=10+x
    =>3=10+x
    =>x=3-10
    =>x=-7
    Vậy x=-7

  2. Lời giải và giải thích chi tiết:

    5 – ( 9 – x ) = 15
    9 – x = 5 – 15
    9 – x = -10
    x = 9 – (- 10 )
    x = 9 + 10
    x = 19
    ________________________

    -(+8) + ( 11 – x ) = 10
    11 – x = 10 + 8
    11 – x = 18
    x = 11 – 18
    x = -7

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