25×cos40
    505*1/50
    1-[(1-0.02)^(11-1)]*[0.02^(1-1)]-[(1-0.02)^(11-2)]*[0.02^(2-1)]-[(1-0.02)^(11-3)]*[0.02^(3-1)]
    1-[(1-0.02)^(11-1)]*[0.02^(1-1)]-[(1-0.02)^(11-2)]*[0.02^(2-1)]
    1-[(1-0.02)^(11-1)]*[0.02^(1-1)]
    1+1/2+(1/2)^2+(1/2)^3+(1/2)^4+......+(1/2)^98+(1/2)^99+(1/2)^100
    1+1/2+（1/2）^2+(1/2)^3+(1/2)^4+(1/2)^5+(1/2)^6+(1/2)^7+(1/2)^8+(1/2)^9+......+(1/2)^98+(1/2)^99+(1/2)^100
    1+1/2+（1/2）^2+(1/2)^3+(1/2)^4+......+(1/2)^100
    1+1/2+（1/2）^2+(1/2)^3+(1/2)^4......+(1/2)^100
    8/4*14/15*12/5
    2005/399
    401*5/399
    1/(1/2+1/3)
    10÷(1＋1＋1)
    23/15-4/9-5/9
    7/15+7/12+8/15-7/12
    8/9+3/10-2/9+7/10
    42*12
    29/24-(5/24-1/11)
    5.24+3/7+2.76+4/7

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