489.20÷14
    631.56×[（tan（arccos0.64）-tan（arccos0.92）]
    631.56/850.80
    √(〖721.78〗^2+450.45²)
    1662.78*0.7
    1094.43*0.7
    643.5*0.7
    902.23*0.7
    721.78/902.23
    902.23*0.7
    902*0.7
    721/850
    721➗850
    721/850
    √(〖721.78〗^2+850.80²)
    π*1
    π*1
    624111+926782
    117871/6.15%×（1-1/（1+6.15%）^25.33)×(1/(1+6.15%)^8)
    92548/(6.15%-2.75%)×(1-((1+2.75%)^8/(1+6.15%)^8))

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