400*64.3-400t=150*165.3-150t
    400/165.3*t = 150/64.3*t
    400/165.3*t=150/64.3*t
    3^x=9^x
    x+tan(0.8x)=0
    -πx/(1-x^2)^0.5=ln0.25
    6*x^4+2*x^2-1＝0
    xe＾（1/x）
    300*12*a=70000+40*12a
    x/（215-x-0）＝0.2
    x/（385-x-18.06）＝0.2
    x/（385-x-18.06）＝0.3
    x/74-18=x/65
    （8-x）2=x
    （40-25-x）(400+5x)=4250
    1/3x/9=16/1/3x
    12589x^2+1000x-1=0
    12589.254x^2+1000x-1=0
    X*0.04=1870000
    X*0.4=1870000

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