【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered...

【简答题】（1）计算：22+32=______．（2）已知方程：x2-1=0，则x=______．

【简答题】设0＜θ＜ ，已知 ， ,猜想 ＝________．

【简答题】由1+3=22，1+3+5=32，1+3+5+7=42，猜想1+3+5+7+…+（2n+1）=______．

【单选题】How much sleep does a person need?【B1】the physiological bases of the need for sleep remain conjectural(猜想), rendering conclusive answers to this question impossible, much evidence has been gathered on...

【简答题】解下列方程：（1）x2-2x-3=0（2）（x-1）（x+2）=4（3）2x2-4x-5=0（4）（x-1）2-2x（x-1）=0．

【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered...

【单选题】当1，2，3，4，5，6时，比较和的大小并猜想（）

【判断题】孪生素数猜想已经被证明出来了。()

【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathere...