求解y"=e2y+ey,且y(0)=0,y’(0)=2.

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问题 求解y"=e2y+ey,且y(0)=0,y’(0)=2.

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答案 [*] p2=e2y+2ey+C, 即 y’2=e2y+2ey+C. 又y(0)=0,y’(0)=2,有C=1,所以 y’2=e2y+2ey+1=(ey+1)2, y’=ey+1(y’(0)=2>0), [*] y-ln(ey+1)=x+C1. 代入y(0)=0,得C1=一ln 2,所以,该初值问题的解为 y—ln(1+ey)=x—ln 2.

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