题目

—Who do you think can do the voluntary work? —________ who is willing to help can do it. A . No one B . Anyone C . Someone D . Neither 答案：B实数范围内因式分解：（1）x2-5x+3；  （2）x2-22x-3；   （3）3x2+4xy-y2；（4）（x2-2x）2-7（x2-2x）+12．