2^x=a 3^x=b
(6^x)-6*(9^x)+4^x=0
ab-6b^2+a^2=0
(a+3b)(a-2b)=0
a=-3b或a=2b
2^x=-3*3^x(无实数解)
或2^x=2*3^x
(2/3)^x=2
x=log(2/3)(2)---(2/3)为底
2^x=a 3^x=b
(6^x)-6*(9^x)+4^x=0
ab-6b^2+a^2=0
(a+3b)(a-2b)=0
a=-3b或a=2b
2^x=-3*3^x(无实数解)
或2^x=2*3^x
(2/3)^x=2
x=log(2/3)(2)---(2/3)为底