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    arccos(22×cos20.562/(22+2×1×cos14))
    arccos(13×cos20.562/(13+2×1×cos14))
    arccos(13×cos20.562/(13+2×1×cos14))
    0.95×1.1×√((1+0.8)/(0.8-0.7))
    4.1*9.73
    18773*823642856545
    555*6
    (1+5%)^4×5%/[(1+5%)^4-1]
    (1500+37.50)×(1+5%)^4×5%/[(1+5%)^4-1]
    (1500+37.50)×(1+5%)4×5%/[(1+5%)4-1]
    A(3,2)
    7÷(5÷11)×(15÷11)÷(15×7)×5
    sqrt0.010269
    (1/25+1/20)*5
    (1/25+120*5)
    (1/25+1/20)*5
    (1/25+1/20)*5
    (1/25+1/20)5
    (1/25+1/20)
    1/4*(-2%)+3/4*(10%)=

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