Toán Lớp 7: $3^{x}$ +$3^{x-1}$ +$3^{x-2}$
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Toán Lớp 7: $3^{x}$ +$3^{x-1}$ +$3^{x-2}$
Tìm x
Comments ( 2 )
3^x+3^x:3+3^x:9=1053
3^x+3^x. 1/3+3^x. 1/9=1053
3^x(1+1/3+1/9)=1053
3^x. 13/9 =1053
3^x=1053:13/9
3^x=729
3^x=3^6