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
    e^1.09
    2/3*14.3*400^3*(sin(0.414*180))^3+360*7500*400*(sin(0.414*180)+sin(0.422*180))/π=
     （700000-35） ÷49
    (4×1.4/4×10^6)/(3.14×1.142)
    C(4,3)
    C(4,2)
    C(8,1)

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