... Khc Hng - THPT Qu Vừ s - http://nguyenkhachuong.tk 0,5 0, 125 0 ,25 0, 125 im 0, 125 0, 125 0, 125 0, 125 ộx = (nhnchainghim) -2 x ờở = Vy,phngtrỡnh óchocúhainghim :x = v x = Cõu3 Tớnhtớchphõn 2 (1im) ... Tacú I = ũ dx + ũ dx 0 ,25 2 ( x + 2) ( x + 2) ã Tatớnh 2 2 x ( x+ 2) 2 A=ũ dx = ũ dx - ũ dx = ln x+ + = ln 0 .25 2 x + ( x + 2) ( x + 2) ( x + 2) ộlog x = ờờ ờởlog2 x = -2 2 ln x ln x dx 1 x dx= ... Nuy=0thỡ (1) 2 t x = ty , t >0 ,phngtrỡnh utrthnh: + = (1) ( t + 1) t + 2t - 1 + t (2t -1) 0 ,25 2 = = = t + 2t - 2t + 2t - (2t - 1) + 2t - + ( 2t - +1) 2 1 (1') + = + = (2) 2 2 ( t + 1) ( 2t - +...