cosx×x
    2X-4*（60-X）=30
    2X-4（60-X）=30
    x+x*0.06=11520
    12k-12=0
    x+x*0.06=2400
    x+x*0.06=57600
    1865*（1-x）=1399
    x+x*0.06=12000
    x+x*0.06=1200
    3.549= -6*10^(-06)*x^2 + 0.0095*x + 0.2565
    1/4*x^2+7/4*x-15=0
    tanX=0.8
    x+4+20+15%x+（x+15%x）*13%=2600
    s＾2+15s+70
    100-5*（20-x）=70
    arctan(x)+arctan(0.1x)+arctan(100x)-arctan(8.33x)=1.57
    arctan(x)+arctan(0.1x)=0.61
    arctan(x)+arctan(0.5x)=1.57
    arctan(x)+arctan(0.1x)=1.57

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