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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