[(10.5%-4%)×0.0295-(11%-4%)×0.5×0.0295]/[(10.5%-4%)×0.0295+(11%-4%)×0.0289-(10.5%+11%-2×4%)×0.5×0.0295]
    [(0.5%-0.1%)×0.000625-(0.8%-0.1%)×0.5×0.000625]/[(0.5%-0.1%)×0.000625+(0.8%-0.1%)×0.0004-(0.5%+0.8%-2×0.1%)×0.5×0.000625]
    (0.15-0.05)×0.0064+(0.1-0.05)×0.01-(0.15+0.1-2×0.05)×0.5×0.1×0.08
    =(0.15-0.05)×0.64+(0.1-0.05)×0.01-(0.15+0.1-2×0.05)×0.5×0.1×0.08
    300+300/（1+5%）+300/（1+5%）100+5
    -⅓ x
    3－5/3
    tan(arccos0.65)
    tan(arccos0.6)
    arccos√3/3
    ㏑（0.5×√2）
    ㏑0.5×√2
    ㏑0.5
    tan67.5
    55196∧e0.021876×39.15
    (80+31+30√3+40)/1.5
    50√3/1.2
    40/1.5
    50√3
    (120+31+30√3)/1.5

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