用简便方法计算.5-37-4716+38+5859-(56-712)1112+58+18+11279-(13+49)320+815+1720.-数学
),
=
+1,
=1
;
(3)
-(
-
)
=
-
,
=
;
(4)
+
+
=(
+
)+(
+
)
=1+
=1
;
(5)
-(
+
)
=-
-
-
,
=
-
,
=0;
(6)
+
+
=
+
=
1 |
6 |
=1
1 |
6 |
(3)
5 |
9 |
5 |
6 |
7 |
12 |
=
5 |
9 |
1 |
4 |
=
11 |
36 |
(4)
11 |
12 |
5 |
8 |
1 |
8 |
1 |
12 |
=(
11 |
12 |
1 |
12 |
5 |
8 |
1 |
8 |
=1+
3 |
4 |
=1
3 |
4 |
(5)
7 |
9 |
1 |
3 |
4 |
9 |
=-
7 |
9 |
4 |
9 |
1 |
3 |
=
1 |
3 |
1 |
3 |
=0;
(6)
3 |
20 |
8 |
15 |
17 |
20 |
=
3 |
20 |