(100+10m)(3+m)+(360-100-10m)5.4
    5x+32/2=26
    9*x^4-270x^3+773x^2-556=0
    1-e^(-4x^2-2.8x)=2.8x
     22607÷x×20000=86
    50000÷x×20000=86
    22607÷x×20000=86
    22607÷x×20000=86.4332
    5cosx/x+1
    4482.82*e^(-0.09x)+355.56x = 4456.82
    4482.82*e^(-0.09x)+355.56x = 4516.82
    4482.82*e^(-0.09x)+355.56x=4486.82
    4482*e^(-0.09x)-355.56x=4486.82
    10X+230*10=2500*2X
    （21.16+x）*0.005=1.05x
    （40-x）（8+0.004x）-20x-320=1184
    -1/3x-4/3=-3x+12
    5t^2+6t-0.12
    arctan(x)
    4.32*（20-x）+210.4+92.6=（6.48*x+188+25+50）/1.5

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