{1-[(0.498+0.468)-(0.498*0.468)]}÷(1-0.488)
    {1-[(0.498+0.635)-(0.498*0.635)]}÷(1-0.801)
    {1-[(0.498+0.561)-(0.498*0.561)]}÷(1-0.671)
    {1-[(0.498+0.505)-(0.498*0.505)]}÷(1-0.535)
    {1-[(0.498+0.392)-(0.498*0.392)]}÷(1-0.428)
    1+e^(-cos1)
    (1250+1500)/2
    (10.5+2.25)/((7000−1000)×0.839×0.9)
    （4.5+25）/((7000-1000)*0.95*0.9)
    （4.5+25）/((700-1000)*0.95*0.9)
    （4.5+25）/((7500-1000)*0.95)
    （4.5+25）/(7500-1000)*0.95
    370*13.1/8=
    sin（3π＋π/6）
    （2/5）^-4
    169/24
    328/42
    428/73 495/63
    152/22 293/43 302/44 457/52
    854/42 804/42 260/43 260/44

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