50.8×77+82.07×74.5
    50.8+38.17
    （10217.28-7277.92）/77
    10217.28-7277.92
    50.8×77+84.64×74.5
    25.4+5.55
    （5749.55-5322.12）/77
    25.4×77+46.95×74.5+3.78×78.3
    25.4×77+46.95×71.7
    50.8+45.31=
    （10767.09-7277.92）/77
    50.8×77+92.02×74.5
    50.8×77+46.95×71.7
    200*(1+6%)^2+200*(1+6%)^1+200
    (1+6%)^5-1/6%
    20*(1+6%)^5/6%
    (1+0.06)^5-1/0.06
    20*((1+0.06)^5-1/0.06)
    20*((1+6%)^5-1/6%)
    20*(1+6%)^5-1/6%

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