21.α=135° 22.距离为√2/2 23.f(x)=x^2-2x 24.2(cosπ/3+isinπ/3) 25.侧面积是2√3π高中\高三数学\填空题21.α=135° 22.距离为√2/2 23.f(x)=x^2-2x 24.2(cosπ/3+isinπ/3) 25.侧面积是2√3π
