1650-10r=1000+60r
    (tanx)^2+2/(cosx)^2+6(tanx)^2/(cosx)^2+1=0
    x^2*sinx+（1/4）sinx
    x*0.06/(1+x*0.06)=0.99
    x*0.06/1+(x*0.06)=0.99
    （5600-1800）*20%-［6000*8%-x］=504
    50-5p=-10+5p
    (360-x-280)(5x+60)=7200
    x²-340x+2400=0
    x^3+3x^2+4x
    0.3x+（-0.23）*（1-x）=0.04
    5/6X-1/6=1/8
    5X-1.4X=14.4
    30%*x+（-23%）*（1-x）=4%
    2(5+36+x)=88.4+200-2x
    1.6（1＋X）＝2.5
    x
    3151.114-2985.506+(1-b)*157.316=322.924-b*157.316
    6x=18
    6.37*x/（x-6.37）=7.97

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