题目内容
简便计算:
(1)24.87-0.53-1.47
(2)50×(
+
-
)
(3)0.375×
+
-
÷
.
(1)24.87-0.53-1.47
(2)50×(
| 3 |
| 10 |
| 2 |
| 5 |
| 6 |
| 25 |
(3)0.375×
| 15 |
| 2 |
| 3 |
| 8 |
| 1 |
| 2 |
| 8 |
| 3 |
分析:(1)将0.53与1.47结合计算,再用24.87减去两个数的和;
(2)直接根据乘法分配律计算;
(3)先将小数化成分数,再将算式中的除法转化成乘法,再运用乘法分配律计算.
(2)直接根据乘法分配律计算;
(3)先将小数化成分数,再将算式中的除法转化成乘法,再运用乘法分配律计算.
解答:解:(1)24.87-0.53-1.47,
=24.87-(0.53+1.47),
=24.87-2,
=22.87;
(2)50×(
+
-
),
=50×
+
×50-50×
,
=15+20-12,
=35-12,
=23;
(3)0.375×
+
-
÷
,
=
×
+
-
×
,
=(
+1-
)×
,
=8×
,
=3.
=24.87-(0.53+1.47),
=24.87-2,
=22.87;
(2)50×(
| 3 |
| 10 |
| 2 |
| 5 |
| 6 |
| 25 |
=50×
| 3 |
| 10 |
| 2 |
| 5 |
| 6 |
| 25 |
=15+20-12,
=35-12,
=23;
(3)0.375×
| 15 |
| 2 |
| 3 |
| 8 |
| 1 |
| 2 |
| 8 |
| 3 |
=
| 3 |
| 8 |
| 15 |
| 2 |
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 8 |
=(
| 15 |
| 2 |
| 1 |
| 2 |
| 3 |
| 8 |
=8×
| 3 |
| 8 |
=3.
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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