求微分方程y(dy/dx)=-x满足初始条件y∣x=1=4的特解.
分离变量得ydy=-xdx,两端积分得丢(1/2)y2=-(1/2)x2+C1,或x2+y2=C.由初始条件得C一17,则所求特解为x2+y2=17.
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