Mathematics
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    90-arctan(2×√2)
    90-arctan(2×√2
    450×0.12
    -arctan(3.5
    -arctan(2.4)
    80*85/6+8*85/6
    88*85/6
    20000 ÷ (1+10%)^1+36000 ÷ (1+10%)^2 -[ 15000+10000÷(1+10%)^0.5+ 10000÷(1+10%)^1.5]
    20000 ÷ (1+10%)1+36000 ÷ (1+10%)2 -33181.8
     15000+10000÷(1+10%)0.5+ 10000÷(1+10%)1.5
    20000 ÷ (1+10%)1+36000 ÷ (1+10%)2 -[ 15000+10000÷(1+10%)0.5+ 10000÷(1+10%)1.5]
    86+79
    (3.2-1.3)
    (3.2-1.3)×19×1.89+53.68
    (3.2-1.3)×1.89×19+22.28
    (3.2-1.3)×0.53×19+101.55
    一8一(一8)
    8+2
    12.5/(1-0.75)
    30000*2.75%*3+30000

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