2. The first floor is wet, unsafe and has poor lighting. The top floor is high. Although it is very hot in summer, there is air conditioning. The ventilation effect is particularly good. In summer, you can open the window for ventilation, which is also very cool.
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Master Ta (Kou \ Cai \ W E1φ 8,86,7)
F (x) = ax3+bx2+CX+d (a ≠ 0) f' (x) = 3ax2+2bx+c = 0 △ = 4b2-12ac = 0, and b 2 = 3ac, so x =-.