2×10.5×√1.57
    7.54×(2.4)×0.854-2×9×√0.854+-2×10.5×√0.87
    2*sqrt(3)/3+sqrt(21)/3
    sqrt((7+2*sqrt(7))/(7-2*sqrt(7)))
    cos150
    ((5+13^0.5)/(5-13^0.5))^0.5
    700÷25×（96＋18×28）
    225×9
    333*888/999
    （1500*460-240*1200）/300
    （1400*460-300*1200）/200
    （1500*300-240*1400）/100
    （550+11）×[（1+0.0435）^1-1]
    550×0.02=
    750*935-695*500
    0.9489-0.9786
    0.0183+0.0916+0.2381
    0.9^5
    0.9^3*0.1
    0.2+0.8*0.15+0.8*0.85*0.1

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