性质1[6(xkx=kf(xkd(k为常数) 性质2 I∫(x)±g(x)k=f(x)g(x)b 性质3(对积分区间的可加性) CA(ydx= f(xxx+rf(xdx 性质4x=b-a 性质5若在[a,(a<b)上fx)≥0,则 ∫∫(xn≥0kf x dx k f x dx b a b a  ( ) = ( ) (k为常数) f x g x dx f x dx g x dx b a b a b a   [ ( ) ( )] = ( )  ( ) f x dx f x dx f x dx b c c a b a   ( ) = ( ) + ( ) 性质3(对积分区间的可加性) 性质2 性质1 ( )  0  f x dx b a 性质5 若在[a,b] (a<b)上f(x)≥0,则 dx b a b a = − 性质  4