题目内容
(
+
)
×(
-
)
.
3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
(
+
)
×(
-
)
=[(
+
)×(
-
)]
=1
=1.
3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
=[(
3 |
2 |
3 |
2 |
1 |
2 |
=1
1 |
2 |
=1.
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1 |
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3 |
2 |
3 |
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1 |
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2 |