[(6700-500)/3+500-35+15×20×2]×2+[(5000-800)/3+500-35×2×15×18]×2
    0.3842811/9*2.4+（2/9*1.102^3-2/9*0.727^3）*2.2
    √2/2×√2
    1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1；0.2×2+0.4×4+0.6×6+0.8×8+1×10+1.2×12+1.4×14+1.6×16+1.8×18
    （1+5.16）2
    (1.37*10^(-5))*e(-14914.60188/673)
    (1.37*10^(-5))*e(14914.60188/673)
    tan12.73
    cos12 +100sin12=
    2*3.14*（12+2）*1/4+2*2
    2*3.14*12*1/4
    √2/2*√2
    √2/2*√2/2
    arccos0.9642
    arccos0.9460
    √(0.8^2+2.8^2)
    √0.8^2+2.8^2
    √(3-1)
    114514+1919810
    85.5/1.22+85.5/(1.22^2)+85.5/(1.22^3)+85.5/(1.22^4)

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