挑战习题
1/3单选题
难度:

1.

方程内根的个数有(     )


A

0个

B

1个

C

2个

D

3个

提示1:
PHA+5rGC5a+85Ye95pWwPC9wPg==
提示2:
PHA+5om+5Ye65Y2V6LCD5Yy66Ze0PC9wPg==
提示3:
PHA+6K6h566X5Yy66Ze056uv54K55YC8PC9wPg==
正确答案:Qg==
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