Tích phân-Đềsố1(thửsứctrướckỳ thi)

Câu III, đ s 1, th sc trưc k thi (THTT) Bi ton ( )          x x I x π + + = + ∫ Hưng d"n    a a b b α α =         a a a b b b b = − Gii ( ) ( ) ( )                x x x x x x + + + = + − + +  ( ) ( ) ( )        x x x= + + − +  ( ) ( ) ( )          x x x x= + + + − + ( ) ( ) ( ) ( )                          x x I x dx x x dx x dx x π π π π + + = = + + + − + + ∫ ∫ ∫ ∫  ( )             x x I I I I x π + + = = + − + ∫  ( )      I x dx π = + ∫        x t x t t π π   = − ⇒ = − =  ÷     dx dt = − Đi cn ( )       I x dx I π = + = ∫    I I⇒ − = ! ( )       I x x dx π = + ∫    t x = +   dt xdx = Đi cn ( )          I x x dx tdt π = + = ∫ ∫    dt u t du t dv dt v t  = =   ⇒   =   =           "      I t t dt t t t e = − = − = − = ∫ #$% ( )       "     x x I x e π + + = = + ∫  π x t   π  x t   π  