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

Toán Lớp 6: Tìm x ∈ Z, sao cho: 7^2x-6=49 x(x-1)=0 [ 3.(x+2):7 ].4=120

Toán Lớp 6: Tìm x ∈ Z, sao cho:
7^2x-6=49
x(x-1)=0
[ 3.(x+2):7 ].4=120

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    7^2 (x-6)=49
    <=> 49 (x-6)=49
    <=> x-6=49 : 49
    <=> x-6=1
    <=> x=1+6
    <=> x=7
    Vậy x=7
    x(x-1)=0
    <=> [(x=0),(x-1=0):}
    <=> [(x=0),(x=1):}
    Vậy x \in {0;1}
    [3(x+2):7].4=120
    <=> 3(x+2):7=120 : 4
    <=> 3(x+2):7=30
    <=> 3(x+2)=30.7
    <=> 3(x+2)=210
    <=> x+2=210 : 3
    <=> x+2=70
    <=> x=70-2
    <=> x=68
    Vậy x=68 

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

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