题目内容
(2012?黔东南州模拟)
| 口算. 18÷
45 45 ; |
1-
|
4-(
3
3 ;
| ||||||||||||||||||||||||||||||
|
(
|
(
|
分析:①④把除法改写为乘法,约分计算;
②先算乘法,再算减法;
③⑥先算括号内的,再算括号外的;
⑤先算括号内的,再算括号外的除法,最后算括号外的加法.
②先算乘法,再算减法;
③⑥先算括号内的,再算括号外的;
⑤先算括号内的,再算括号外的除法,最后算括号外的加法.
解答:解:18÷
÷
=45; 1-
×
=
; 4-(
+
)=3
;
÷
=
; (
+
)÷
+
=
; (
+
)÷
=
.
故答案为:45,
,3
,
,
,
.
| 3 |
| 5 |
| 2 |
| 3 |
| 5 |
| 7 |
| 21 |
| 25 |
| 2 |
| 5 |
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
| 4 |
| 9 |
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
| 23 |
| 20 |
| 1 |
| 6 |
| 1 |
| 2 |
| 6 |
| 7 |
| 7 |
| 9 |
故答案为:45,
| 2 |
| 5 |
| 3 |
| 8 |
| 4 |
| 9 |
| 23 |
| 20 |
| 7 |
| 9 |
点评:考查了四则混合运算,注意运算顺序和运算法则.
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