题目内容
简算
16.45-(4.45+
)
36×(
+
-0.5)
×0.75+
÷
-
.
16.45-(4.45+
3 |
7 |
36×(
2 |
3 |
3 |
4 |
4 |
7 |
3 |
4 |
7 |
3 |
3 |
4 |
分析:(1)16.45-(4.45+
),运用减法的运算性质进行简算;
(2)36×(
+
-0.5),运用乘法分配律进行简算;
(3)
×0.75+
÷
-
,把0.75化成分数,把除数转化为乘它的倒数,再运用乘法分配律进行简算.
3 |
7 |
(2)36×(
2 |
3 |
3 |
4 |
(3)
4 |
7 |
3 |
4 |
7 |
3 |
3 |
4 |
解答:解:(1)16.45-(4.45+
),
=16.45-4.45-
,
=12-
,
=11
;
(2)36×(
+
-0.5),
=36×
+36×
+36×0.5,
=24+27+18,
=69;
(3)
×0.75+
÷
-
,
=(
+
-1)×
,
=0×
,
=0.
3 |
7 |
=16.45-4.45-
3 |
7 |
=12-
3 |
7 |
=11
4 |
7 |
(2)36×(
2 |
3 |
3 |
4 |
=36×
2 |
3 |
3 |
4 |
=24+27+18,
=69;
(3)
4 |
7 |
3 |
4 |
7 |
3 |
3 |
4 |
=(
4 |
7 |
3 |
7 |
3 |
4 |
=0×
3 |
4 |
=0.
点评:此题考查的目的是运用运算定律和运算性质对小数、分数四则混合运算进行简便计算.
练习册系列答案
相关题目