微分方程y'+y''=xy''满足条件y'(2)=1,y(2)=1的解 A、y=(x-1)2B、y=(x+1/2)2-21/4C、y=1/2(x-1)2+1/2D、y=(x-1/2)2-5/4 发布时间:2025-07-05 21:13:25