题目内容
计算:
(1)-
+
-
+
(2)
-
+
-
(3)-3
-(-2
)+3
(1)-
(3)-3
(1)-
(2)0;(3)
;
(1)-
+
-
+
(2)
-
+
-
=
=
+
-(
+
)
=-
=1-1
=0
(3)-3
-(-2
)+3
=
=
=
=
=
=-
=0
(3)-3
=
=
=
=
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