（10+x）（500-10x）=8000
    1＋5/xx-1
    1.3x-x=150
    8*x*x*x-6x+1
    x（10-2x）=12
    2100（1+x）+2100（1+x）(1+2x)*11+700(1+2x)*12=1.875*21700
    46200x^2+71424x=7087.5
    X/21.75*16+X=4500
    2x^2+2x+3
    X = 0.4375*[1-(1+0.01025)^-47]/0.01025+100/(1+0.01025)^47
    x ^2 *e ^x
    X=0.4375*[1-(1+0.0103)^-47]/0.0103+100/(1+0.0103)^47
    X=0.4375*[1-(1+0.0206)^-47]/0.0206+100/(1+0.0206)^47
    10800=(2500-50y)(y-20)
    10800=(10*(40-y)/2+500)(y-20)
    50y^2-3000y+50800=0
    xe^x=1/4
    14000+19500+630（a-20-30）-500a =127000
    46.2×a+46.2×a×0.5=24.5784
    46.2×0.35+46.2×0.35×a=24.486

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