Solve the exponential equation 3^x+1-3^x=18點解3^X可以抽出嚟?
回答 (3)
2015-12-31 11:15 am
Sol
3^(x+1)－3^x=18
3*3^x－3^x=18
2*3^x=18
3^x=9
x=2
3^(x+1)－3^x=18
3*3^x－3^x=18
2*3^x=18
3^x=9
x=2
2015-12-31 2:02 pm
3^(x+1)-3^x=18
(3^x)(3)-3^x=18
(3^x)(3-1)=18
3^x=9
3^x=3^2
x=2
(3^x)(3)-3^x=18
(3^x)(3-1)=18
3^x=9
3^x=3^2
x=2
2015-12-31 12:16 pm
3^x+1-3^x=18
1=18
1=18
收錄日期: 2021-04-18 14:14:54
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