问题
填空题
已知：幂函数y=m2xm2-m-1的图象不过原点，则实数m的值为______．
答案
因为函数为幂函数，所以m2=1，解得m=1或m=-1．
又因为幂函数的图象不过原点，所以幂指数m2-m-1＜0．
当m=1时，m2-m-1=-1＜0成立．
当m=-1时，m2-m-1=1＞0不成立．
所以满足条件的m=1．
故答案为：1．
搜题请搜索小程序“爱下问搜题”
已知：幂函数y=m2xm2-m-1的图象不过原点，则实数m的值为______．
因为函数为幂函数，所以m2=1，解得m=1或m=-1．
又因为幂函数的图象不过原点，所以幂指数m2-m-1＜0．
当m=1时，m2-m-1=-1＜0成立．
当m=-1时，m2-m-1=1＞0不成立．
所以满足条件的m=1．
故答案为：1．
Passage Two
Why are the prices of mobile telephone services lower in China’s eastern coastal region
A．The average disposable income is lower in the region.
B．The GDP is higher in the region.
C．The costs of operators are lower due to a greater number of users of mobile phone services in the region.
D．The operators compete with each other in order to win over subscribers.
