题目内容
脱式计算
2-
|
|
(
|
分析:①按运算顺序先算除,然后按从前往后的顺序计算;
②把
÷
变成
×
,然后乘法的分配律计算简便;
③先算小括号里的除,再算括号外面的除,最后算加;
②把
| 5 |
| 14 |
| 7 |
| 5 |
| 5 |
| 14 |
| 5 |
| 7 |
③先算小括号里的除,再算括号外面的除,最后算加;
解答:解:①2-
÷
-
,
=2-
-
,
=
;
②
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
③(
+
)÷
+
,
=
×
+
,
=
+
,
=
.
| 6 |
| 13 |
| 9 |
| 26 |
| 1 |
| 3 |
=2-
| 4 |
| 3 |
| 1 |
| 3 |
=
| 1 |
| 3 |
②
| 5 |
| 14 |
| 7 |
| 5 |
| 5 |
| 7 |
| 9 |
| 14 |
=
| 5 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 9 |
| 14 |
=
| 5 |
| 7 |
| 5 |
| 14 |
| 9 |
| 14 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
③(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 7 |
| 10 |
=
| 9 |
| 20 |
| 7 |
| 10 |
=
| 23 |
| 20 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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