100000*(1+0.3)^5
    100000*(1+0.15)^5
    100000*(1-0.05)^5
    100000*(1.028)^5
    1/3-36+64
    1/3-36
    4.3*10∧0.4
    5.84*22.4
    10∧0.4÷4.3
    5.58×22.4
    10∧0.4÷4.5
    10∧-6.6÷4.5÷10∧-7
    lg0.54
    lg0.5
    28*12
    (6890-500)/((1-1/(1+7.9%/12)^36)/7.9%*12)
    ^(6890-500)/[1-1/(1+7.9%/12)^36]/7.9%*12
    (6890-500)/[1-1/(1+7.9%/12)^36/7.9%*12]
    e^7%-1
    5000*[[1-1/(1+6.5%)^19]/6.5%+1]

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