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

Toán Lớp 6: Giúp vs mng 310-6.(120-2x)=190 81-62:(3x+7)=79 Thanks<3

Toán Lớp 6: Giúp vs mng
310-6.(120-2x)=190
81-62:(3x+7)=79
Thanks<3

Comments ( 2 )

  1. 310-6.(120-2x)=190
    <=>6(120-2x)=120
    <=>120-2x=20
    <=>2x=100
    <=>x=50
    Vậy x=50
                                                                             
    81-62:(3x+7)=79
    <=>62:(3x+7)=2
    <=>3x+7=31
    <=>3x=24
    <=>x=8
    Vậy x=8

  2. Giải đáp + Lời giải và giải thích chi tiết:
    310 – 6.(120 – 2x) = 190
    <=> 6.(120 – 2x) = 310 – 190
    <=> 6.(120 – 2x) = 120
    <=> 120 – 2x = 120:6
    <=> 120 – 2x = 20
    <=> 2x = 120 – 20
    <=> 2x = 100
    <=> x = 100 : 2
    <=> x = 50
    81 – 62 : (3x + 7) = 79
    <=> 62 : (3x + 7) = 81 – 79
    <=> 62 : (3x + 7) = 2
    <=> 3x + 7 = 62 : 2
    <=> 3x + 7 = 31
    <=> 3x = 31 – 7
    <=> 3x = 24
    <=> x = 24 : 3
    <=> x = 8
    @Ryan
     

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

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