(sqrt(3*10+1)-2)*(sqrt(3*10+1)+2)
    (sqrt(3*3+1)-2)*(sqrt(3*3+1)+2)
    sqrt200-sqrt40
    0.15/0.22*100=
    0.98*(24-8)/24*(24-6)/24
    320.643-309.589+10+6.15+0.544+2
     7.4+19 18.3+13 106-72 59-26 47-23 67-11 86.7-17.2 37.1-7 29+107 99-45
    129-15 77-35 56+5 66+2 78.5-51 71.3+5 6.6+3.9 23.3+22 7.1+12.5 6.9+3.7
     76-32 94-61 98+13 95+23 82-16 71+25 7.2+25.6 97.3-4.2 20+6.9 21.3+6
    113-78 58+5 109-56 43+7.6 36+109 110+12 95+60 17.9+1.2 28.6+51 75+19
     37+18 1.2+5.8 36.2-1 145-77 88-16 89-65 77.6-1.3 32-21 29+15 54-30
    70-12 102-55 6.9+9 10.8+5 99-35 47+25 42+33 54+2.9 5.7+17 46+35
     98-23 74-21 26+13 9.8+22 96-47 26.6+1.8 1.7+44.1 1.34+4.6 1.1+81 5.9+6.3
    96-13 39.2+2.9 109-5 13+49 67+56 55.9+4 6.5+10 5.3+12 2.9+34 75+19
     4.9-1.5 58-5.3 8.6+6.7 11.9+15.2 94-32 65+16 1.5+13.9 92-41 2.6+27.2 96-22
    9.7-2.7 68-27 2.4+52 7.6+26 9.7+0.5 9.2-3.2 2.9+7.7 83+14 3+58.1 19.8-16
     43-10 54-9 0.3+6.9 6.6+19.2 99-25 95+18 1.5+12.9 89-41 1.6+6.6 68-23
    97-22 58-17 64+32 3.5+6.5 58+7 9.5-3.1 2.3+9.1 47+14 2+25.7 19.9-7
     8.9-6.2 63+19 9.4-2.5 4.9+6.5 6.9-1.7 5.9+4.2 0.9+6 5.9-2.5 14.6-4.3 16.5-2.4
    6.8+1.7 0.37+9.6 2.9+7.6 12.9+1.2 37+8 5.9+43 1.8+9.5 1.6+5.9 7+1.6 89-21

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