(32-x)(20-x)=570
    (33-x)(20-x)=510
    (x-20)(600-10x)=3840
    (x-20(600-10x)=3840
    x(600-10x)=3840
    (40-x)(20+2x)=1200
    1+x+xx/9=109
    1+x+xx/3=109
    （1/10x+10）÷（x+10）=2/11
     3x^2+42*x-128 = 0
    3x^2+42*x-128=0
    128+128(1+x)+128(1+x)²
    94 = 100/ (1+r/2)
    89 = 100/ (1+r)
    94.84= 4/ (1+r/2) + 4/ (1+r/2)^2 + (4+100)/ (1+r/2)^3
    97.12= 5/ (1+r/2) + 5/ (1+r/2)^2 + 5/ (1+r/2)^3 + (5+100)/ (1+r/2)^4
    2^2-2(2K-1)=(2K-1)^2
    X*0.9=15880
    X*0.98=2000
    2＝5×(t+0.25)^2-5t^2

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