题目内容
计算,能简算的要简算.
(
-
)×
÷
;
×
+
×
+
÷
.
(
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 10 |
| 8 |
| 3 |
考点:分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算小括号里面的减法,再算括号外的乘法,最后算括号外的除法;
(2)先把除法变成乘法,再运用乘法分配律简算.
(2)先把除法变成乘法,再运用乘法分配律简算.
解答:
解:(1)(
-
)×
÷
=
×
÷
=
÷
=
;
(2)
×
+
×
+
÷
=
×
+
×
+
×
=(
+
+
)×
=2×
=
.
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 1 |
| 8 |
| 1 |
| 4 |
=
| 1 |
| 2 |
(2)
| 1 |
| 2 |
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 10 |
| 8 |
| 3 |
=
| 1 |
| 2 |
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 10 |
| 3 |
| 8 |
=(
| 1 |
| 2 |
| 4 |
| 5 |
| 7 |
| 10 |
| 3 |
| 8 |
=2×
| 3 |
| 8 |
=
| 3 |
| 4 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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