题目1单选题
计算不定积分<img src="https://tihai-oss-cloud.itihey.com/img/7bda6cd8c4d100fde8a49d57eaa9860f.png">时,可以做代换<img src="https://tihai-oss-cloud.itihey.com/img/5dd3d22fe0ff622d3f4af85ee549002a.png">( )去掉根式A. . <img src="https://tihai-oss-cloud.itihey.com/img/f299de2661e0da838a2d70f0ba3c3b6a.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/1d0a7eab501d606f00bf465cd42741eb.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/814cf757e940e6685f97953344a821bd.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/2397aa44e5e6c95f2af0acb3f37853ad.png">