x-550-（5+10+x*0.06/12）=50
    √（1+z^3）+√（1-z^3）=√（2+2√2）
    √z=2√2
    30*（1-y）+60y=22.92*(1-y)+76.44*y
    2t^2+6t
     x^2+0.052x-0.10044=0
    457*tan(x/2)*sin(x)=150
    457*tan(x/2)*cosx=150
    sin(40)/sin(120)=sin(x)
    110+y=190-y
    180- 【 (40-y) +30] =240-(y+50)
    x+1/2-1=2+2-x/4
    180- 【 (40-y) +30] =240-(y+50)
    (0.3x÷(1-0.02x²))=90
    52X-X×2X-96=300
    403/31*x+155/31*(x+15)+93/31*(x+30)=683
    （x-2）（48-2x）=300
    x^ex+1=e
    -90 = -arctan0.1x-arctan0.2x-arctan35.7x+arctan3.57x
    -90 = -arctan0.1x-arctan0.2x-arctan31.1x+arctan3.11x

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