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Anonymous users2024-02-07Follow your heart, if you don't like it, you can make it clear, and you have already insisted on the last moments of high school, don't regret your previous persistence in this last time. College entrance examination, come on. , and finally this time. Come on.
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Anonymous users2024-02-06Just calm down and don't think too much.
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Anonymous users2024-02-05Tell him that you like him just like a friend.
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Anonymous users2024-02-041. f(3+x)=f(3-x): axis of symmetry x=3The minimum value of this function is -3: let the function be:
y=a(x-3) -3 has two intersections with the x-axis, and the distance between them is 4: these two intersections are: (1,0), (5,0).
0=a(1-3)²-3
a=3 4 The function is: y=3 4(x-3) -3
2. Let ab=x 0=-2
x-2)²>=2
2- 2=4, with the vault as the coordinate origin, the horizontal direction as the x-axis, and the vertical direction as the y-axis to establish the coordinate system.
The parabola passes through the vertex (0,0), (4,-5), (4,-5).
Let the parabolic equation be y=ax
5=a(-4)²
a=-5/16
y=-5/16x²
Wooden boat beam 4 m: x = 2
y=-5/16*2²
y=-5/4
5/4|<2=High.
When the water rises to the distance between the parabolic vaults 5 4 = meters, the wooden boat begins to be unnavigable5, and the problem is problematic and cannot be solved.
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Anonymous users2024-02-031.(1) f(3+x)=f(3-x), so the axis of symmetry of the function = 3, the image has two intersection points with the x-axis, and the distance between them is 4
Then the two intersections of the function on the x-axis are (1,0), (5,0), so f(x)=a(x-1)·(x-5), the minimum value =-3 so f(3)=-3 i.e., a(3-1)·(3-5)=-3, so a=3 4
The analytic formula f(x)=3 4(x-1)(x-5), so in (- 3) monotonically decreasing, (3,+ monotonically increasing.
2.You need a diagram, otherwise you can't guess which side of the triangle PR is.
3.Same as the first question, the intersection of x-axis 2 is (-1,0),(5,0) 4a+2b+c=-9 ,a(2+1)(2-6)=-9,a=3 4 ,b=-15 4,c=-9 2 Let's take it by yourself by listing an inequality.
Because f(-3) = f(3), x 2+3 3, so f(x 2+3) f(-3).
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