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How credible can Feng Shui be?

Feng Shui thought pays great attention to geology, even critical, and thinks that geology determines people's physique, which is also proved to be scientific by modern science. Some feng shui masters grind with their hands when they meet the ground, observe on the spot, chew the soil with their mouths, even dig wells to see the deep soil and water quality, and bend over to listen to the flow and sound of groundwater. These seemingly posturing are not unreasonable.

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Master Ta (oral color \ micro/? : 3 9 9 6, 1 9,4)

Solution: Let the analytic expression of quadratic function be y = ax2+bx+c∶ and the symmetry axis be x=4∴-b/2a=4? That is, the quadratic function with b=-8a has two intersections with the X axis and one intersection with the Y axis. Let the intersection with the X axis be (x 1, 0, (x2, 0), and the intersection of x2 > x 1 with the Y axis be (0, c). It can be concluded that the base of the triangle formed by x1+x2 =-b/ax1* x2 = c/a is x2-x1x2-x1= √ (x2+x1) 2-4x/kloc.