x²-116x+1344=0
    1/2（x-2）²＝-1
    300=30x+2x²
    2^3.31=-(x-116)*ln2
    2^(m+39)=-(m+21.41)*ln2
    x/lnx
    10÷x=12÷（x+2）+0.5
    x(2x-3)=2
    1+a%÷1-2%=1-6%
    －5x²+180x+800=1440
    x-0.6+0.0968*exp(0.2*x)-0.0231/x+(0.0231/x)*exp(0.15*x)=0
    （20-x）（100+20x）=3000
    e^cosx
    （x-4）（x-3）（x-2）
    -2.9t²＋3t=0.78
    -2.9t²＋3t=0.78
    q^2=(-5+sqrt(21))/2
    0.3/2.5=x/5
    3.6:4.8=x:7.2
    7:x=3:15x

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