1/3*3
    1/（0.011/786.4+0.989/785.3）
    1/（0.5/808.6+0.5/804.36）
    400000/[((1+0.04/12)^84-1)/0.04/12](1+0.04/12)
    sqrt((19/3-1)^2+16)
    (2.488*0.024)/(1+1.488*0.024)
    （2.488*0.541）/(1+1.488*0.541)
    arctan0.0904127
    e2+e-4
    (2.84/1000)*1*(28.5408/0.98)^(2/3)
    （1+5％）^0.5
    (2.84/1000)*1*(12.294/0.98)^(2/3)
    √47
    260%
    -0.2*0.56^2
    (12000×380+300×200^3)/(380+200)^3 +3/(380+200) (1/(12000×380)+1/(300×200))^(-1)
    (10000×80^3+10000×100^3)/(80+100)^3 +3/(80+100) (1/(10000×80)+1/(10000×100))^(-1)
    (12000×50^3+12000×80^3)/(50+80)^3 +3/(50+80) (1/(12000×50)+1/(12000×800))^(-1)
    1807-（2*1807-2200-1400）-1570
    120×24+120÷24

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