调查的顺序是:(1)搞清楚调查对象(2)____(3)____(4)完成调查报告。
已知f(x)是偶函数,且f(x)在0,+∞)上是增函数,如果f(ax+1)≤f(x﹣2)在x∈12,1上恒成立,则实数a的取值范围是( )
二次函数y=x2﹣4x﹣3的顶点坐标是____.
— ___________
— I'm OK.
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I think he should tell the news to his father. (改为否定句)
I ____ tell the news to his father .