求大神帮小妹解答一下好吗,我已经用了很多种方法了可是还是做不出来,心里压着不好受,求定积分

2025-06-28 04:00:13
推荐回答(2个)
回答1:

下图提供三种详细解法:

(点击放大)


回答2:

用分部积分法:∫udv = uv - ∫vdu
u = -√(1 - x²), dv = -dx/x² = d(1/x), v = 1/x
不定积分为F(x) = -x⁻¹√(1 - x²) - arcsinx + C
F(1) = -arcsin1 + C = -π/2 + C
F(√2/2) = -√2*√(1 - 2/4) - arcsin(√2/2) + C = -1 - π/4 + C

定积分为 -π/2 + C - ( -1 - π/4 + C) = 1 - π/4