Mathematics
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    5.6×1.9
    1/(0.05+0.13) + 1/(0.15+0.13) + 1/(0.05+0.15+0.13)
    282164/70.68
    81048+201116
    15701/4.8%×(1-1/(1+4.8%)^48)×(1/(1+4.8%)^8)
    11087/(4.8%-3.5%)×(1-(1+3.5%)^8/(1+4.8%)^8)
    1+1.1+1.2+1.3+1.4+1.5+1.6+1.7+1.8+1.9+2 (9+8.1+7.11+6.111+5.1111+4.11111+3.111111)÷21.06172835 98765.4321×1234.56789-98765.4322×1234.56788
    272010÷70.68
    10667/(4.8%-3.5%)×(1-(1+3.5%)^8/(1+4.8%)^8)
    66485/((1+6%)^7)=
    886473*(13/52)*(3/10)=
    1.643/2
    15*42000*(1+5%)^7=
    420*[tan(arccos0.77)-tan(arccos0.92)]
    650*[tan(arccos0.77)-tan(arccos0.92)]
    73×137
    333333333333333×333333333333333 777777777777777×999999999999999 444444444444444×555555555555555 1×9+2×9.9+3×9.99+4×9.999+5×9.9999+6×9.99999
    1²+1²+2²+3²+5²+8²+13²
    sqrt(1.5 / (4 - 1))
    (2 + 2 + 1 + 2) / 4

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