sin30*cos30
    48+80-2*60
    89+65
    -1-0.75/(3/7)*(-6+27）
    A(10,3)
    -90＋arctan(12/0.1875)-arctan(12/0.028)-2arctan(12/12)
    -90＋arctan(1.5/0.1875)-arctan(1.5/0.028)-2arctan(1.5/12)
    -90＋arctan(0.1875/0.1875)-arctan(0.1875/0.028)-2arctan(0.1875/12)
    -90＋arctan(0.028/0.1875)-arctan(0.028/0.028)-2arctan(0.028/12)
    -90＋arctan(0.046/0.3)-arctan(0.046/0.046)-2arctan(0.046/7.5)
    -90-arctan0.046
    -90arctan0.046
    -0.032666667*15.145^3+ 1.404666667*15.145^2-20.141333333*15.145+101.920000000
    0.011666667*15.145^3-0.505000000*15.145^2+ 7.303333333*15.145-34.670000000
    0.004833333*15.145^3- 0.208000000*15.145^2+2.997166667*15.145-13.970000000
    0.0048*15.145^3 - 0.208*15.145^2 + 2.9972*15.145 - 13.97
    0.0117*15.145^3 - 0.505*15.145^2 + 7.3033*15.145 - 34.67
     -0.0327*15.145^3 + 1.4047*15.145^2 - 20.141*15.145 + 101.92
    （0.65+1.75）*0.65/2-（0.4+1.75）*0.4/2
    （0.76+1.9）*0.75/2-（0.71+1.9）*0.5/2

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