Mathematics
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    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)
    5× (-6) - (-4)2 ÷ (-8)
    1/30×36+1/2×(-6)+52/15
     3.54*189.8*√cos(14)*√(1.3*0.99*100000*7÷20÷37.144÷37.144÷6)
     3.54*189.8*√cos(14.25719)*√(1.3*0.99*100000*7÷20÷37.144÷37.144÷6)
     3.54*189.8*√cos(14.25719)*√(1.3*0.99*100000*7÷20÷37.144÷37.144÷6)
     3.54*189.8*√cos(12.1015)*√(1.3*5.73*100000*5.18÷20÷35.05÷35.05÷4.18)
     3.54*189.8*√cos(18.83)*√(1.3*2.6*100000*4.32÷50÷60.24÷60.24÷3.32)

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