3*x^4+40*x^3+161*x^2+260*x+100=0
    (6+y)÷（30+10+y）=10%
    700x^5=208x^4+615x^3+866x^2+734x+715
    1350000(1+x)^3=200000(1+x)^2+200000*(1+x)+200000
    2:14=x：3.5
    80-x÷3=74
    （1+2x)/3>x-1
    40:6=5:x
    10 - 0.08n = 1.3 *sqrt(0.00001*n+1.6)
    x-3(x-2)大于等于4
    x-3(x-2)>=4
    (5-X)^3+2-3*(5-x)=0
    2/3x+5>1-x
    1/2xX8=2/3X（440-x）X5
    e^x=0.1x
    e^x=x
    2/3+5>1-x
    （sinx）/x=1.316
    -(1-x)*(1-x)*lnX=0.18
    16+0.13X=8+0.19（X-30）

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