0.001575^2+0.019944^2+2*0.539*0.001575*0.019944
    82.5^2-920*82.5+61370
    330*616/(13.8*200)
    13.8*250*60*(458-30)
    2+5/1
    2+1/5
    （0.788^3-1.5*0.788^2+0.5*0.788）÷6
    0.788^3-1.5*0.788^2+0.5*0.788
    （0.007875^2+0.01108^2+2*0.539*0.007875*0.01108）
    √(2-√(3))
    [12-(33-35 )]÷2 89×[34-(716-690)] (220＋80)÷(3×2) 26×(500-100÷5) 987＋(287＋135) 568＋(68＋178) 100÷(2＋2)×2 1000÷[(2＋2)×2]
    [12-(34-35 )]÷2 89×[34-(716-560)] (220＋80)÷(3×2) 26×(500-100÷5) 987＋(287＋135) 568＋(68＋178) 100÷(2＋2)×2 1000÷[(2＋2)×2]
    18%+20
    10×(36+300÷15) (128+232)÷5 142+(25×22+78) 210÷[(538-258)÷40] 720÷(61-49)×50 (105×12-635)÷25 (16+4)×80 (76-24)×17
    5.9*2
    (148-2988÷36)×17 3650÷[(58-33)×2] (25+15)÷5 8×(20-12) (20+25)÷15 697-(197+346) (160-48÷12)×5 672÷[(36-29)×6]
    52×(300-145÷5) (1379+450÷18)×40 (52+1548÷18)×24 6000-(100×36+400) (3618÷18-145)×35 72÷(24-12) (99-45)÷9 64-(35-7)+88
    5/8+3/4-1
    63÷(44-37) (89-35)÷9 24÷(4×2) 72÷(46-38) [(35-7)×2]÷7 89×[34＋(716-14)] [12-(34-35)]×10 (785-545)÷(32+28)
    63÷(44-37) (89-35)÷9 24÷(4×2) 72÷(46-38) [(35-7)×2]÷7 89×[34-(716-14)] [12-(34-35)]×10 (785-545)÷(32+28)

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