挑战习题
1/4单选题
难度:

1.已知,则是(过程要求用配凑法)(    )
A
B
C
D
提示1:
IDxpbWcgd2lkdGg9Mzk2IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0IzL0E0L3JCQUNFMVBrZkdfVEF1a0JBQUFEaXg3V29BMDE0MC5wbmciPg==
正确答案:Qw==
6Kej5p6Q77yaPGltZyB3aWR0aD0zOTYgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQjMvQTQvckJBQ0UxUGtmR19UQXVrQkFBQURpeDdXb0EwMTQwLnBuZyI+LDxicj7iiLQ8aW1nIHdpZHRoPTExNyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9CMy9BNC9yQkFDRTFQa2ZHNkRnci1NQUFBQ1Z4WEdJcU0yMDgucG5nIj48YnI+5pWF6YCJQw==