题目内容
计算下面各题.
×(
+
)
(
+
)÷
(
÷
)+
×
.
| 7 |
| 10 |
| 5 |
| 16 |
| 21 |
| 32 |
(
| 2 |
| 13 |
| 15 |
| 26 |
| 19 |
| 52 |
(
| 4 |
| 15 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
分析:(1)(2)先算括号内的,再算括号外的;
(3)先算除法和乘法,再算加法.
(3)先算除法和乘法,再算加法.
解答:解:(1)
×(
+
)
=
×
=
(2)(
+
)÷
=
×
=2
(3)(
÷
)+
×
=
×
+
×
=
+
=
| 7 |
| 10 |
| 5 |
| 16 |
| 21 |
| 32 |
=
| 7 |
| 10 |
| 31 |
| 32 |
=
| 217 |
| 320 |
(2)(
| 2 |
| 13 |
| 15 |
| 26 |
| 19 |
| 52 |
=
| 19 |
| 26 |
| 52 |
| 19 |
=2
(3)(
| 4 |
| 15 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 4 |
| 15 |
| 3 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 2 |
| 5 |
| 1 |
| 3 |
=
| 11 |
| 15 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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