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
    -16-3*4*（1/3-1/2）/（-1 1/3）
    -1/6+3/4-1/12
    (((3/8)-(3/4))/(1/16))+(-0.6)*(10/3)
    (((3/8)-(3/4))/16)+(-0.6)*(10/3)
    0.04×lg0.00035+0.96×lg0.0005
    0.44×lg0.00041+0.56×lg0.00064
    lg0.00069×0.04
    lg0.00043×0.96
    1008/700

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