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

Toán Lớp 6: 1, Tìm x 3 ^x +2 + 3^x +190 =1000

Toán Lớp 6: 1, Tìm x 3 ^x +2 + 3^x +190 =1000

Comments ( 1 )

  1. Ta có: $3^{x+2}$+2+3^x+190=1000
    ⇔$3^{x}$ .$3^{2}$+$3^{2}$+190=1000
    ⇒$3^{x}$($3^{2}$+1)=810
    ⇒$3^{x}$.(9+1)=810
    ⇒$3^{x}$.10=810
    ⇒$3^{x}$=81
    ⇒$3^{x}$=$3^{4}$
    ⇒x=4
    #Yêu chủ tus nhìu <3333 
     

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

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