X- 2/5=2
    X- 2/5=2
    arctanx+arctan(0.2*x)=90
    ex=1/2x+1
    1500+200x=600+800x
    1500+200x=600+80x
    1500+200x=500x
    4000/1.6x－4000/ x＝30
    0.7×40x＝0.8×40×（x－6）
    4^x+5^x=9^x
    4^x+6^x=9^x
    330/（x＋30）＝240/x
    330/x＋30＝240/x
    4^x-x^2-2x-1=（x+1）2^x
    X/30+X/42+X/56=1
    3x^2-lnx-1=0
    cosx-sinx
    X+X/94.3%*5.7%=80280.96
    π*(D^2-48^2)=1000000*4*0.042
    π*(D^2-74^2)=1000000*4*0.042

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