题目内容
计算下面各题
(1)2
+0.75+1
(2)15-8
+2
(3)9.9-3
+(5-3
)
(1)2
| 5 |
| 56 |
| 5 |
| 12 |
(2)15-8
| 8 |
| 11 |
| 1 |
| 2 |
(3)9.9-3
| 7 |
| 20 |
| 2 |
| 5 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)把0.75化成分数,从左向右进行计算;
(2)从左向右进行计算;
(3)先算小括号里的减法,再从左向右进行计算.
(2)从左向右进行计算;
(3)先算小括号里的减法,再从左向右进行计算.
解答:
解:(1)2
+0.75+1
=2
+
+1
=2
+1
=5.
(2)15-8
+2
=6
+2
=8
;
(3)9.9-3
+(5-3
)
=9.9-3
+1
=6.55+1.6
=8.15.
| 5 |
| 56 |
| 5 |
| 12 |
=2
| 5 |
| 56 |
| 3 |
| 4 |
| 5 |
| 12 |
=2
| 47 |
| 56 |
| 5 |
| 12 |
=5.
(2)15-8
| 8 |
| 11 |
| 1 |
| 2 |
=6
| 3 |
| 11 |
| 1 |
| 2 |
=8
| 17 |
| 22 |
(3)9.9-3
| 7 |
| 20 |
| 2 |
| 5 |
=9.9-3
| 7 |
| 20 |
| 3 |
| 5 |
=6.55+1.6
=8.15.
点评:此题考查了分数、小数四则混合运算的顺序.
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