题目内容
脱式计算
÷[
×(
-
)]
(
+
)÷
+
.
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 5 |
| 3 |
| 10 |
(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
分析:算式①②都要按照分数四则混合运算的顺序进行计算,有括号的先计算括号内部的,后计算括号外面的.
解答:解:①
÷[
×(
-
)],
=
÷[
×(
-
)],
=
÷[
×
],
=
×10,
=5
;
②(
+
)÷
+
,
=(
+
)×
+
,
=
×
+
,
=
+
,
=1
;
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 4 |
| 7 |
| 1 |
| 3 |
| 6 |
| 10 |
| 3 |
| 10 |
=
| 4 |
| 7 |
| 1 |
| 3 |
| 3 |
| 10 |
=
| 4 |
| 7 |
=5
| 5 |
| 7 |
②(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=(
| 16 |
| 20 |
| 5 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 14 |
| 20 |
=1
| 3 |
| 20 |
点评:此题主要考查分数的四则混合运算的运算顺序,考查了学生认真解答题目的学习习惯.
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