题目内容
105×(
+
-
)
2 |
3 |
1 |
5 |
4 |
7 |
105×(
+
-
),
=105×
+105×
-105×
,
=70+21-60,
=91-60,
=31.
2 |
3 |
1 |
5 |
4 |
7 |
=105×
2 |
3 |
1 |
5 |
4 |
7 |
=70+21-60,
=91-60,
=31.
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题目内容
2 |
3 |
1 |
5 |
4 |
7 |
2 |
3 |
1 |
5 |
4 |
7 |
2 |
3 |
1 |
5 |
4 |
7 |