-20*21+475+26250/21
    50*525
    (50-40)*(20+525/40)
    (50-21)*(20+525/21)
    -20*40+475+2625/40
    -20*21+475+2625/21
    5+3√5
    5-√5
    5+√5
    5+5^-1
    -2.5*-1.5*0.8
    -2+-3+1
    -2+4
    -2-4
    4/-2
    4-6
     1.38*(2/(2.4-0.4*1.38^2))^0.5
    0.8*(2/(2.4-0.4*0.64))^0.5
    0.4*(2/(2.4-0.4*0.4^2))^0.5
    (1.4*287*583.98)^0.5

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