Mathematics
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    243.61+18.3×1.7
    175.57+18.9×3.6
    19.9×2.2+131.79
    19.0×1.9+19.9×3.1+34
    19.0×1.9+34
    19.9×5+34
    -3500+1255*(1+10%)6-1/10%*(1+10%)6=
    -3500+1255*(1+10%)6-1/10%*(1+10%)6=
    -3500+1255*(1+10%)6-1/10%(1+10%)6=
    【30*(1+10%)^5+30*(1+10%)^4】
    【30*(1+10%)^5+30*(1+10%)^4】
    【1-(1+10%)^-5】/10%
    【1-(1+10%)^-3】/10%
    【30*(1+10%)*5+30*(1+10%)*4】*10%
    (1+4%/4)^4-1
    ln0.29
    ln0.75
    1-e-1
    1-e(-0.2)
    1-e(-1.5)

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