题目内容
计算:
×4+8×
+
×2 (
-
)+
×(
+
)+
.
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 2 |
| 13 |
| 1 |
| 91 |
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)运用乘法分配律简算;
(2)按照先算括号里面的运算,再算括号外面的运算;
(3)
×(
+
)这一部分运用乘法分配律简算,进而再加上
得解.
(2)按照先算括号里面的运算,再算括号外面的运算;
(3)
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
解答:
解:(1)
×4+8×
+
×2
=
×(4+8+2)
=
×14
=8
(2)(
-
)+
=(
-
)+
=
+
=
=
(3)
×(
+
)+
=
×
+
×
+
=2+
+
=
.
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
=
| 4 |
| 7 |
=
| 4 |
| 7 |
=8
(2)(
| 4 |
| 7 |
| 2 |
| 13 |
| 1 |
| 91 |
=(
| 52 |
| 91 |
| 14 |
| 91 |
| 1 |
| 91 |
=
| 38 |
| 91 |
| 1 |
| 91 |
=
| 39 |
| 91 |
=
| 3 |
| 7 |
(3)
| 12 |
| 5 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
=
| 12 |
| 5 |
| 5 |
| 6 |
| 12 |
| 5 |
| 3 |
| 4 |
| 4 |
| 5 |
=2+
| 9 |
| 5 |
| 4 |
| 5 |
=
| 23 |
| 5 |
点评:此题考查数的四则混合运算,要仔细观察算式中数的特点,能简算的就运用定律进行简算,不能简算的就按照运算顺序计算.
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