A.3 B.5 C.-2 D.-4
A.1 B.-1 C.1/2 D.廣義積分發(fā)散
A.xe-x B.-xe-x C. D.-
A.1 B.-1 C.1/2 D.0
A.收斂于(2/3)ln2 B.收斂于(3/2)ln2 C.收斂于(1/3)ln(1/4) D.發(fā)散