... phngtrỡnhcúmtnghimduynht x =0 2 + x Tớnhtớchphõn: I = ũ dx 2x + CõuIII I = ũ 1,0 2+ x + 2x dx = 1,0 2 + 2x dx 2x ũ 1+ t t = 2x ị t = 2x ị dx =td x = ị t = icn: x = ị t =2 0 .25 0 .25 www.VNMATH.com ịI= 2 ( + ... x = + 3t thng (d) : ù y = -4 - 2t ù z = + 2t ợ Cõu VIA .2 1,0 uuuu r Gis ( D) ct (d) ti M ( + 3t -4 - 2t1 + 2t ) ị AM = ( 3t - -2t - 22 t + ) r Mtphng(P)cúvtpt n = ( -2 -3 ) r uuuu r ( D) //(P) n.AM ... ịI= 2 ( + t )tdt 1 ũ + t = ũ( + t - + t )dt 20 0 .25 t = ( + t - ln | t + 1|) = ( -ln ) 2 KL ChohỡnhchúpSABCDcúỏyABCDlhỡnhthangvuụngtiAvD,AB= AD= 2a, CD=a,gúcgiahaimtphng(SBC)l(ABCD)bng60 GiIltrungimca...