— Nowadays, it seems that many young people can't live without smart phones.
— ________. I think it's bad for their health.
A:I'm afraid not
B:I hope not.
C:Exactly.
D:Of course.
奇函数f(x)在3,7上是增函数,在3,6上的最大值是8,最小值是﹣1,则2f(﹣6)+f(﹣3)等于____.
已知x2+x﹣5=0,求代数式(x﹣1)2﹣x(x﹣3)+(x+2)(x﹣2)的值.