Mathematics
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    28420÷12÷52
    24360÷12÷45
    21315÷12÷40
    21315÷12÷45=
    28000×(1+1.5%)
    24000×(1+1.5%)
    21000×(1+1.5%)
    1283552+1607732
    233323/4.8%×(1-1/(1+4.8%)^14)×(1/(1+4.8%)^8)
    175583/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    1135520+1423988
    206657/4.8%×(1-1/(1+4.8%)^14)×(1/(1+4.8%)^8)
    155333/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    839441+1056499
    153325/4.8%×(1-1/(1+4.8%)^14)×(1/(1+4.8%)^8)
    114831/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    arctan0.36=
    (398*1.7+1200 )*2.2*20/1.3*1.85
    (398*1.2+1200)*20/1.3*1.85
    √(30)^2+(40)^2

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