cos1/x^2
    (3x^3-4x^2+5x-1)/(x^2+3x-1)
    5x^3+146x^2=3600
    （x+0.0075）x=0.0000009
    （x+0.0075）x=0.0000009
    （x+3）²-4（x+3）-5=0
    x*x + x = 6417293346268110
    x*x+x= 6417293346268110
    tanx=3.33
    (5600-1800) *Y-5000* (1+Y) *8%* (1-50%)=0
    x*3*1.3*1.66=4.29
    x*1.05*1.3*1.66=4.29
    x*3*1.3*1.66=4.29
    x^3+5x^3-25/2x+25/4=0
    100*a=120
    (8100+65+X)*3.3%=4X
    1+x=0
    969.37-0.04V
    3:x=9:18
    0.3939=0.3944*（1+a）^8

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