[
-
]·
-6
;
+(-
)2=________.
(
)2-
=________;
下列各式中一定成立的是( )
A.
=
+
=3+4=7
B.
=
-![]()
C.(-
)2=
D.
=1-
=![]()
下面的计算中,错误的是 ( )
A.
=±0.03 B.±
=±0.07
C.
=0.15
D.-
=-0.13
判断题(对的打“∨”,错的打“×”)
(1)(
)2=-
( )
(2)
=-
( )
(3)(-
)2=-
( )
(4)(2
)2=2×
=1
( )
