tanx
    tanx
    256w^4+68w^2-3=0
    （X-180）*（1-25%）/1500=（X-180-320）*（1-25%）/1000
    （x-1）∧4
    x^x=x^22
    0.6*（1+x）/12+x
    （12424-X）/X=0.7
    (x-180)x(1-25%)÷1500=(x-180-4000x8%)x(1-25%)÷1000
    1.247x-0.136912sin(2πx)-0.16125=0.2122(sin(πx))^3+0.042sin(πx)+0.042sin(1.25π-2πx)
    x2-15708x+99429.35=0
    （39.402+x）×2.5＝39.402+72.604-x
    X×x+x等于600
    （39.402+x）×2.35＝39.402+72.604-x
    （39.402+x）×2.2＝39.402+72.604-x
    （39.402+x）×2.25＝39.402+72.604-x
    （39.402+x）×2.05＝39.402+72.604-x
    0.04×(1511+x)＝x
    1-1/(1+(h/91/2)^2)^(3/2)=0.176/3.175
    1-1/(1+(h/101/2)^2)^(3/2)=1.374/4

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