题目内容
简便计算.
| 44×0.25 |
|
(
|
分析:①44×0.25把44拆成4×11再利用乘法的结合律计算;
②把
×
变成
×
,再利用乘法的分配律计算;
③把除以
变成乘24,再利用乘法的分配律计算.
②把
| 3 |
| 5 |
| 13 |
| 14 |
| 13 |
| 5 |
| 3 |
| 14 |
③把除以
| 1 |
| 24 |
解答:解:①44×0.25,
=11×(4×0.25),
=11;
②
×
+
×
,
=
×
+
×
=
×(
+
),
=
×
,
=
;
③(
+
-
)÷
,
=(
+
-
)×24,
=
×24+
×24-
×24,
=15+20-22,
=13.
=11×(4×0.25),
=11;
②
| 3 |
| 5 |
| 13 |
| 14 |
| 3 |
| 14 |
| 1 |
| 5 |
=
| 13 |
| 5 |
| 3 |
| 14 |
| 3 |
| 14 |
| 1 |
| 5 |
=
| 3 |
| 14 |
| 13 |
| 5 |
| 1 |
| 5 |
=
| 3 |
| 14 |
| 14 |
| 5 |
=
| 3 |
| 5 |
③(
| 5 |
| 8 |
| 5 |
| 6 |
| 11 |
| 12 |
| 1 |
| 24 |
=(
| 5 |
| 8 |
| 5 |
| 6 |
| 11 |
| 12 |
=
| 5 |
| 8 |
| 5 |
| 6 |
| 11 |
| 12 |
=15+20-22,
=13.
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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