题目内容
混合运算(能简便的要简便)
-
+
2-
-
+(
-
)
| 5 |
| 8 |
| 3 |
| 5 |
| 1 |
| 4 |
2-
| 1 |
| 9 |
| 8 |
| 9 |
| 11 |
| 20 |
| 9 |
| 10 |
| 1 |
| 5 |
分析:从左往右依次计算即可;
运用连减的变形进行计算;
先算括号里面的,再算括号外面的.
运用连减的变形进行计算;
先算括号里面的,再算括号外面的.
解答:解:
-
+
=
+
=
;
2-
-
=2-(
+
)
=2-1
=1;
+(
-
)
=
+
=
.
| 5 |
| 8 |
| 3 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 40 |
| 1 |
| 4 |
=
| 11 |
| 40 |
2-
| 1 |
| 9 |
| 8 |
| 9 |
=2-(
| 1 |
| 9 |
| 8 |
| 9 |
=2-1
=1;
| 11 |
| 20 |
| 9 |
| 10 |
| 1 |
| 5 |
=
| 11 |
| 20 |
| 7 |
| 10 |
=
| 5 |
| 4 |
点评:考查了分数的简便计算和分数的四则混合运算,注意灵活运用运算律进行简便计算.
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