发布网友 发布时间:2022-07-14 04:15
共4个回答
热心网友 时间:2023-09-16 09:14
一进门,一旁五彩缤纷的菊花绚烂的盛放
热心网友 时间:2023-09-16 09:14
设t=x+2,
原式=∫(t-2)dt/(t3-t)
=∫dt/(t2-1)-2∫dt/(t3-t)
=(1/2)ln[(t-1)/(t+1)]-∫dt2/[t2(t2-1)]
=(1/2)ln[(x+1)/(x+3)]-∫d(t2-1/2)/[(t2-1/2+1/2)(t2-1/2-1/2)]
=(1/2)ln[(x+1)/(x+3)]-ln[(t2-1/2-1/2)/(t2-1/2+1/2)]+C
=[ln(x+1)]/2-[ln(x+3)]/2-ln(x2+4x+3)+2ln(x+2)+C
热心网友 时间:2023-09-16 09:15
Then Lieutenant Blandford’s heart leaped.
热心网友 时间:2023-09-16 09:15
他们哪里可以说是长安最正规的了!去过几次!不错!