题目内容
计算.
(1)3
-1
+
(2)9.6×
-2.4÷
(3)1.25×(2
-
)-
÷2.
(1)3
| 1 |
| 3 |
| 1 |
| 6 |
| 2 |
| 3 |
(2)9.6×
| 2 |
| 3 |
| 3 |
| 4 |
(3)1.25×(2
| 2 |
| 5 |
| 1 |
| 2 |
| 11 |
| 10 |
分析:(1)根据加法交换律进行解答.
(2)先算乘法和除法,最后算减法.
(3)先算小括号里面的减法,再算乘法和除法,最后求差.
(2)先算乘法和除法,最后算减法.
(3)先算小括号里面的减法,再算乘法和除法,最后求差.
解答:解:(1)3
-1
+
,
=3
+
-1
,
=4-1
,
=2
,
(2)9.6×
-2.4÷
,
=6.4-3.2,
=3.2,
(3)1.25×(2
-
)-
÷2,
=1.25×1.9-
÷2,
=2.375-0.55,
=1.825.
| 1 |
| 3 |
| 1 |
| 6 |
| 2 |
| 3 |
=3
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 6 |
=4-1
| 1 |
| 6 |
=2
| 5 |
| 6 |
(2)9.6×
| 2 |
| 3 |
| 3 |
| 4 |
=6.4-3.2,
=3.2,
(3)1.25×(2
| 2 |
| 5 |
| 1 |
| 2 |
| 11 |
| 10 |
=1.25×1.9-
| 11 |
| 10 |
=2.375-0.55,
=1.825.
点评:本题综合考查了学生的计算能力.
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