... Q( 4), v( 4), và Sf (4 ). xQQQQxQ+=2 ) 1 () 2 () 3 () 4( (4 .8 8) tAAAAtA+=2 ) 1 () 3 () 2 () 4( (4 .8 9) xyyyyxy+=2 ) 1 () 2 () 3 () 4( (4 .9 0) xvvvvxv+=2 ) 1 () 2 () 3 () 4( ... xvvvvxv+=2 ) 1 () 2 () 3 () 4( (4 .9 1) 270 y(x + h) = y(x) + hy(x) + !22hy(x) + !3 3hy(x) + ., (4 .7 1) và chuỗi khai triển Taylor tại x-h là: y(x - h) = y(x) - hy(x) + !22hy(x) - !3 3hy(x) ... (in/h) k2 = f [(1 2+ 6), (0 +0. 5(0 . 133 3 in/h )( 1 2h )( 1 ft/2in)] = 30 0 )0 667. 0 () 1 8( outinQQ = 30 0679.05 .37 = 0.1218 (in/h) k 3 = f [(1 2+ 6), (0 +0.1218(in/h).12(h) .(1 ft/12in )) / 2] = 30 0 )0 609. 0 () 1 8( outinQQ...