-90-arctan0.5x-arctan0.05x=-180
    5=(x+16)/x
    x^2-12x+34.6=0
    x(x+1)-2(x-1)=x²-1
    x=x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+11100+2095.24
    x = x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+857.14+5100
    x=x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+14176.47+52000
    24a^2+62a+14=0
    24a^2+62a*14=0
    （（x-40-48）*（1-0.2）/600）=（（x-40）*（1-0.2）/700）
    20lgx=12
    20lgx=-12
    100*sqrt(1+x^2)/(xx*sqrt(1+100x^2)*sqrt(1+(x/50)^2))=1
    x^2-7.1x+ 10.8=0
    lg(x/0.1)=3
    9x²－5＝3
    lgx=30
    lg(x/0.1)=30
    x^2-11.0x+20.0=0
    9x－5＝3

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