When you learn to keep a balance between spending and saving, you are in control of your own financial situation, and which will lead you to a successful and productive life despite the twists and turns on your way to the financial goal.
【简答题】(本题满分14分)如图,已知二次函数 ,直线 l : x = 2,直线 l : y = 3 tx (其中 1< t < 1, t 为常数);若直线 l 、l 与函数 的图象所围成的封闭图形如图(5)阴影所示.(1)求 y=;(2)求阴影面积 s 关于 t 的函数 s=u ( t )的解析式;(3)若过点 A (1, m )( m ≠4)可作曲线 s=u ( t )( t ∈ R )的三...