a |
-a |
A.a>0 | B.a<0 | C.a=0 | D.不存在 |
a-1 |
A.当a≥1时它是二次根式 | B.它是a-1的算术平方根 |
C.它是a-1的平方根 | D.它是二次根式 |
-(x-2)2 |
A.0个 | B.1个 | C.2个 | D.无数个 |
49×144 |
362+482 |
a2 |
(a+1)2 |
A.2a+1 | B.-1 | C.1 | D.-2a-1 |
(b-a)2x |
x |
A.a≥b,x≥0 | B.a≥b,x≤0 | C.a≤b,x≥0 | D.a≤b,x≤0 |
© 2017-2019 超级试练试题库,All Rights Reserved.