... ) tuxftuxxdtdx,,312=++−= ( ) ( ) 000 xx == () () ( ) ( ) ( ) nnnnntuxtfxx ,,1Δ+=+, 2,1,0=n () 00=x ( ) 00=u ( ) ( ) ( ) 0,,000=tuxf ( ) 01=x⇒ () 01=x () 25.01=u ( ) ( ) ( ) ( ) 25.025.0001,,2111=++−=tuxf () ( ) ( ) ( ) 00625.025.0025.012=+= ... s ( ) ( ) ( ) 2120,200−=+−=txf () ( ) ( ) ( ) [] ( ) 8.021.01,0001=−×+=Δ+= txftxx () 8.01=x ( ) ( ) ( ) 344.18.021.0,211−=+−=txf () () ( ) ( ) [] () 6656.0344.11.08.0,1112=−×+=Δ+= ... tính i(t) dùng phương pháp Euler. R = (1 + 3i2 ) Ω, L = 1 H, and v(t) = 10t V.Bài Tập 4.22 () tviRdtdiL =+ ( ) () tviidtdi=++231 ( ) 00=i¾ Ta đặt i = x, và v(t) = u () () ( ) tuxftuxxdtdx,,312=++−= ( ) ( ) 000...