Question

3的x次方乘以e的x次方的不定积分怎么求

Answer 1

∫3^x*e^xdx=∫3^xde^x=3^x*e^x-∫e^xd3^x=3^x*e^x-∫e^x*3^x*ln3dx
所以∫3^x*e^xdx+∫e^x*3^x*ln3dx=3^x*e^x
所以(1+ln3)∫3^x*e^xdx=3^x*e^x
所以∫3^x*e^xdx=1/(1+ln3)*3^x*e^x+常数

Answer 2

∫3^x*e^xdx=∫3^xde^x
=3^x*e^x-lna∫3^x*e^xdx
则(lna+1)∫3^x*e^xdx=3^x*e^x
所以∫3^x*e^xdx=3^x*e^x/(lna+1)+C

Answer 3

∫3^x*e^xdx=∫3^xde^x
=3^x*e^x-lna∫3^x*e^xdx
则(lna+1)∫3^x*e^xdx=3^x*e^x
所以∫3^x*e^xdx=3^x*e^x/(ln3+1)+C

Answer 4

∫3^xe^xdx
= ∫(3e)^xdx
= (3e)^x/ln(3e) + C

Answer 5

=∫(3e)^xdx
=1/ln(3e)∫ln(3e)(3e)^xdx
=(3e)^x/ln(3e)+C