(3319.79*9200+2631.32*5000+1490.23*5000+4380.2*5000+4580.85*5000)/2-3319.79*9200+4580.85*5000
    31.5×0.60=
    18.16×0.60=
    1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+19/35=
    827÷4.1868÷100×60=
    827÷4.18÷100×60=
    832÷4.18÷100×60=
    1/49999999
    0.9×0.85×2×0.45×125
    (307.68×1000×1000)/(0.91×1430×1000×205)
    1.07-0.282/1.75
    1.50×4320/(138.41×138.41)×(10200×450)/(1430×1000)×[√(1+((138.41×18)/(4.4×450))^2 )+0]×1
    (4000×18)/(150×450)
    (7000×18)/(150×450)
    (307.68×1000×1000)/(0.66×1430×1000×205)
    (307.68×1000×1000)/(0.5×1430×1000×205)
    arccos0.9136
    0.7811*1.12184/(1.12184-0.7)+0.2105/(1-0.7)+0.0084*0.54176/(0.54176-0.7)=
    0.7811*1.12184/(1.12184-0.8)+0.2105/(1-0.8)+0.0084*0.54176/(0.54176-0.8)=
    0.7811*1.12184/(1.12184-0.9)+0.2105/(1-0.9)+0.0084*0.54176/(0.54176-0.9)=

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