（x+1）^2+2=0
    x^2-60x-9600=0
    （x-40）［（60-x）×20+300］=6080
    （x-40）［（60-40-x）×20+300］=6080
    5（1+x）²=7.2
    (1+1/x)*e^(-1/x)=0.1758
    4a^2+4.93246a-1.02273=0
    0.3334m^2-2.57192m+1.04488=0
    405x^3-500x=600
    380x^3-500x=600
    x^4-48x^2+1
    −12x^3+5x^2−36^x−300
    610/1235=x/（x+10%）
    -34.5 + 0.5P=300-P
    610/1235=x/（1+10%）
    （220*63-x）*0.95+63*8=13167
    (50/X+6.8)/(40/X十8.5)=0.493/0.507
    （9535+40+X）*（4.69125%+1.25%）=4X
    (40/X十8.5)/(50/X+6.8)= 0.507/0.493
    300-x=-30+0.5x

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