设 <img src='https://fb.fenbike.cn/api/planet/accessories/formulas?fontSize=18&latex=wIheJPaocrK5iKIxv6e2jA' /> 和 <img src='https://fb.fenbike.cn/api/planet/accessories/formulas?fontSize=18&latex=6WI4JmbgOUB2kIzFJ7AsyQ' /> 是微分方程 <img src='https://fb.fenbike.cn/api/planet/accessories/formulas?fontSize=18&latex=Ei2PZQl92La73hUrygebc0AW4f9ufoOY9_5pp8X7ShoPcyCNQzsXL9RONyY-g3N8NQwnA0eyLVssv_GKGWl25g' /> 的两个解, 记 <img src='https://fb.fenbike.cn/api/planet/accessories/formulas?fontSize=18&latex=dXMyhnyN7CDFG4o4w7IVlLnQpr8Dq7RilaI6yNxHJAkxXi6zzOkn8YNET8WW_YtzM7abJlLbbXxTNPoUX3UmNbvliaK0H_J_2CvGjNyzb19ycTnnsG6d5n52mnjdAf_3ltNzsmF48sXpCKRioRZEWg' /> 则 <img src='https://fb.fenbike.cn/api/planet/accessories/formulas?fontSize=18&latex=Mf3PCufEYElCdn15hGYls1QrVFIV-lJF-A9fCyKbHCvYdYLbmryd75zdgw6BsRy57cFN-cdDVml0YtotNerXuetHxCTNXap4BksPy0ViEkz6nLhar8T9yNtPgaa7Vd3J' />