题目内容
在( )里填上合适的数或符号.
+
+
=
+
+
+
+
+
=(
+
)+(
+
)
4-
-
=4-(
).
| 11 |
| 13 |
| 5 |
| 7 |
| 2 |
| 13 |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| 5 |
| 7 |
| 7 |
| 9 |
| 5 |
| 16 |
| 2 |
| 9 |
| 11 |
| 16 |
| 7 |
| 9 |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
| ( ) |
4-
| 5 |
| 14 |
| 9 |
| 14 |
| 5 |
| 14 |
+
+
| 9 |
| 14 |
分析:①②运用加法的结合律及交换律进行解答即可.
③运用加法的性质进行解答即可.
③运用加法的性质进行解答即可.
解答:解:①
+
+
=
+
+
;
②
+
+
+
=(
+
)+(
+
);
③4-
-
=4-(
+
);
| 11 |
| 13 |
| 5 |
| 7 |
| 2 |
| 13 |
| 11 |
| 13 |
| 2 |
| 13 |
| 5 |
| 7 |
②
| 7 |
| 9 |
| 5 |
| 16 |
| 2 |
| 9 |
| 11 |
| 16 |
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 16 |
| 11 |
| 16 |
③4-
| 5 |
| 14 |
| 9 |
| 14 |
| 5 |
| 14 |
| 9 |
| 14 |
点评:本题根据式子中的数值的特点灵活运用运算定律进行解答即可.
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