原题的答案已经画在你的图里了。
P + q = 1, (p + q)^2 = 1, shaded area = (1 - p^2 - q^2) π = 2
PQ=1, 则有，半个阴影=以PQ为直径的圆=Pi/4
布衣之才
2022-01-18 08:09:16P + q = 1, (p + q)^2 = 1, shaded area = (1 - p^2 - q^2) π = 2