题目内容
用你喜欢的方法计算.
+
-
-(
-
)
+
+
+
+
+
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 6 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
| 5 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
| 3 |
| 4 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照从左到右顺序计算解答,
(2)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)运用加法交换律解答,
(4)运用加法交换律和结合律解答.
(2)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)运用加法交换律解答,
(4)运用加法交换律和结合律解答.
解答:
解:(1)
+
-
=
-
=
;
(2)
-(
-
)
=
-
=
;
(3)
+
+
=
+
+
=1+
=1
;
(4)
+
+
+
=(
+
)+(
+
)
=1+1
=2.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 1 |
| 6 |
=
| 7 |
| 12 |
(2)
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 12 |
(3)
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 4 |
=1+
| 1 |
| 4 |
=1
| 1 |
| 4 |
(4)
| 5 |
| 7 |
| 1 |
| 4 |
| 2 |
| 7 |
| 3 |
| 4 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 4 |
| 3 |
| 4 |
=1+1
=2.
点评:(1)正确运用简便方法解决问题,(2)依据四则运算计算方法正确进行计算,是本题考查知识点.
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