24x-2x²=40
    a*1.85-8-a*8=0
    1/2x(x-1)=15
    a（a+15）=4（2a+15）
    x(x-1)+(x+1)(x+2)=0
    -90-arctan(x/2)-arctan(x/20)=-180
    sqrt(2)=x^2*(1+(sqrt(2)-1)^2*x^2)
    3x²+1=6x
    arctanx-90-(180-arctan(x/(4(x^2-1))))-arctan0.1x=-180
    20lg(1/(2x*sqrt(1-x^2)))=8
    180-90-arctan10x-arctan0.1x=30
    x*sqrt(1+100x^2)*sqrt(1+0.01x^2)=10
    x²+x＝1
    x^4+x^2-400=0
    【（260+220）*63-x】*0.85+18*63=26178.65
    x2-5=10
    x.22%=147
    (x^2-x*2)+(x-17)(x-77)=0
    0.130/x＝0.1289/0.86289
    0.4/100.58＝x/32.7

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