arctan0.568
    arc tan0.463
    arctan0.336
    arctan0.252
    （494.86/2.476）*1.8
    1/2×6.28×(60×3+180×28)+3.14×0.7×0.8×[800+5.0×20×(28-3)]
    7030.31+15.7×28
    1/2×6.28×(60×3+180×28)+3.14×0.7×1×[800+5.0×20×(28-3)]
    494.86/0.676 2.476-1.8=0.676 494.86/2.476=199.862682
    2.476-1.8 494.86/2.476=199.862682
    494.86/2.476
    -3/16+1/2+3
    -3/4*1/4+9/4*1/2+3
    0.2+8000/5000*0.01
    （430-234955）/405/16*0.25+(10*900/1029820*10000-70)/13*0.15
    （430-234955）/405/16*0.25+(10*900/1029820*10000-70)/13*0.15+6*1*0.6
    0.42+1.4*e∧(-0.0538*16.458381)
    0.42+1.4*e∧(-0.0538-16.458381)
     0.42+1.4*e∧(-0.8428476932)
    0.42+1.4*e-0.010259391

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