（2000+500）÷（1296.66+X）=2.4390
    -0.00000015x^3+0.00004079xx-0.00867542x+4.93140116=4.5
    -0.00000015x^3+0.00004079xx-0.00867542x+4.93140116=4.75
    -0.00000015x^3+0.00004079xx-0.00867542x+4.93140116=4.88
    0.5*x^2+180*x=18.3408
    5+(x+1)*(x+2)*(x+3)=0
    0.46899/(1+1.37940x)-0.00848/(1-0.03688x)-0.25315/(1-0.58872x) = 0
    (1.021×0.4×0.4)/8+(3.75×0.4)/4
    0.80899/(1+1.37940x)-0.00848/(1-0.03688x)-0.25315/(1-0.58872x)
    （x-200）*2=（x-200-150）*2.2
    85/(1+x)+85/(1+x)^2+1085/(1+x)^3=1040.11
    (16-2x)^2*x=5
    （10-t)（980-8t)=4000
    (16-x)^2*x
    283.38+60.74*x=93.62+1028.44*x+34.85*x
    0.5*x^2+180*x=9.4267
    (x-200)*0.75/3300 = (x-200-150)*0.75/3000
    (X－9458.02)1.04＋9458.02=102397.31
    ((x-200)*(1-25%))/3300=(x-200-150)*(1-25%)/3000
    5X－0.6×3＝2.9

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