X-1%X-15-4%X-2-5.3%X=72.6
    X1*12+1.5%X1-X1=106.47
    X1×12+1.5%X1-X1=202.73
    X-1%X-16-4%X-2.1-5.3%X=77.4
    X-1%X-24.51-4%X-3.27-5.3%X=153.6
    250-x-60=(x-60)/2
    250-x-60=x-60/2
    0.3268＝1.46x-4.7*10^-5
    (x+2)÷(x-2√3)=√3
    x÷（1000-x）=1.78
    480=500cosx
    4（1.57+2xtan20）=4.33
    2/（1+y）＝1.994907
    132.74*（2-0.995f）＝2
    x^2-（0.3+1.75*10^（-5））*x+0.02=0
    x^2+15.4x+1=0
    0.995（1+2y）＝1
    132.74*（1+r-2*0.995r）＝1+r
    58*（1+r-2*0.95r）＝1+r
    lnx/ln5=138-3x

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