3x+5x=72
    x(40-2x)=220
    3x²+3x-2=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.542252)
    12+2y=18
    9+2y=18
    6+2x=18
    3+2x=18
    3x+4=7
    0.01x=36
    X=（186.67+16.82+0.93+0.94+20.44+0.1X）×0.7915
    X=（186.67+16.82+0.96+0.94+20.44+0.1X）×0.7915
    X=4590.52+0.055X+229.53
    X=4303.61+0.055X+215.18
    X=4781.79+0.055X+239.09
    14519×（0.8+0.33h）×h=40653.2
    （248579.8+2350x）/（120.3718+x）=2524.59
    (x+83)/(x+103)=0.85
    f=24+10*ln(1+f/10)
    x=tanx

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