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

Toán Lớp 6: (3x – 2^4). 7^3 = 2. 7^4 10^2 – 7.( 2x – 4^3) = 30 cần gấp.

Toán Lớp 6: (3x – 2^4). 7^3 = 2. 7^4
10^2 – 7.( 2x – 4^3) = 30
cần gấp.

Comments ( 2 )

  1. (3x-16).147=2.1029=2058
    3x-16=2058:147=14
    3x=16+14=30
    x=30:3=10

    100-7.(2x-48)=30
    7.(2x-48)=100-30=70
    2x-48=70:7=10
    2x=48+10=58
    x=58:2=29

  2. Lời giải:
    1)
    (3x-2^4).7^3=2.7^4
    ⇒3x-2^(4)=2.7^(4):7^3
    ⇒3x-16=2.7
    ⇒3x-16=14
    ⇒3x=14+16
    ⇒3x=30
    ⇒x=10
    Vậy x=10
    2)
    10^(2)-7.(2x-4^3)=30
    ⇒100-7.(2x-64)=30
    ⇒7.(2x-64)=100-30
    ⇒7.(2x-64)=70
    ⇒2x-64=10
    ⇒2x=10+64
    ⇒2x=74
    ⇒x=37
    Vậy x=37

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

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