Mathematics
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    tan arccos0.8-tan arccos0.92
    √(〖77.31〗^2+3×〖68.23〗^2 )
    (314.7×10^3×480000)/(122000000×1×20)
    (314.7×10^3×529000)/(122000000×1×20)
    (40.91×10^6)/530435
    (40.91×10^6)/1355556
    (40.91×10^6)/1355556
    300×20×(310-230)
    122000000/(300-230)
    122000000/(310+10-230)
    [(300-230)×20×((300-230))/2]+[300×20×(310-230)]
    200*0.97*8-(2.1*7)-1533
    300×20×150+300×20×310
    [(20×300^3)/12+(230-150)^2×20×300]+[(300×20^3)/12+(90-10)^2×300×20]
    (300×20×150+300×20×310)/(300×20+300×20)
    (12.5+12.8+13.2)/3=
    1552-(7*2)-1530
    200*8*0.97
    (-6) ×8 - (-2)3 - (-4)2 ×5
    5× (-6) - (-4)(-4) ÷ (-8)

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