0 rf(x)tx=「f(ot (1)f(x)为偶函数则f(-1)=f(t) f(d f(xdx+ff(xdx 2f(x) (2)(x)为奇函数,则f(_0)=-f 0 f(xdx=f(xdx+l f(xdx=0f x dx −a 0 ( ) f t dt a  = − 0 ( ) (1)f(x)为偶函数,则 f(−t)=f(t) f x dx f x dx f x dx a a a  a   = + − − 0 0 ( ) ( ) ( ) f x dx a  = 0 2 ( ) (2)f(x)为奇函数,则 f(−t)= −f(t) f x dx f x dx f x dx a a a  a   = + − − 0 0 ( ) ( ) ( ) =0