(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
    15*1/6
    ln1-ln2+ln3-ln4+ln5-ln6+ln7-ln8+ln9
    lne+lge
    1.9×0.73×283.91/200×10^3（1.9×26＋0.08×20/0.01256）
    675/20
    1.3×1/8×16×6.303^2+1.5×1.0×1/8×7.5×6.303^2
    1.3×1/8×16×6.301^2+1.5×1.0×1/8×7.5×6.301^2
    1/1.1
    1/1.08
    80/1.08
    100/1.08

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