0.9*（66+x）=59+x
    0.9*（66+x）=58+x
    X-X*0.15=335
    4*x^2+21*x+20=0
    e^(-x*3.14/sqrt(1-x^2))=0.2
    10×X^2-0.0001×21.8276×X+9.748×0.00000001=0
    90+arctan（x÷2）+arctan（x÷6）+arctan（x÷2）+arctan（1.27×x）－arctan（64.8×x）－arctan（x÷102.8）＝180
    90+2×arctan1.75+arctan0.5833+arctan（3.5×x）－arctan（51.4×3.5x）－arctan（3.5÷102.8）＝225
    0=0.001X^2+(-0.6071×0.00000001)X+(0.0203×0.000000000001)
    0.001X^2-0.6071×10^-10×X-0.0203^10-12=0
    197=（（0.021*x^1.85+326）^0.5）*x^0.84
    0.001×X-0.6071X+0.0203=0
    20000=25(x+2x)+25x
    30÷X十25=85
    37一X一2X=4
    3680000=1.13x
    3x-5=x+1
    6x+90=15-10x+70
    2a+4=a-3
    10X=15

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