一个四边形，它的4个角的度数之和可能大于360度．______．（判断对错）
由分析得出：
四边形的内角和=180°×2=360°．
故答案为：×．
已知函数y=ax3+bx2，当x=1时，有极大值3，则2a+b=（ ）。
下列句子排队排乱了，你给它们排一排，组成完整的句子吧!
1. younger than is My father grandfather my
2. My is mother than older me
3. two grandmothers and I two grandfathers have
4. many there family How people in are your
