题目内容
用简便方法计算.
7-
-
÷
×
+
×
.
7-
3 |
7 |
1 |
7 |
1 |
4 |
4 |
9 |
11 |
5 |
1 |
9 |
11 |
5 |
(1)7-
-
÷
=7-
-
,
=7-(
+
),
=7-1,
=6;
(2)
×
+
×
=(
+
)×
,
=
×
,
=
.
3 |
7 |
1 |
7 |
1 |
4 |
=7-
3 |
7 |
4 |
7 |
=7-(
3 |
7 |
4 |
7 |
=7-1,
=6;
(2)
4 |
9 |
11 |
5 |
1 |
9 |
11 |
5 |
=(
4 |
9 |
1 |
9 |
11 |
5 |
=
5 |
9 |
11 |
5 |
=
11 |
9 |
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