题目内容
(2012?陆良县模拟)7.86+5
+1.14+
9
-(3.75+4
)
7684×101-7684
9
÷1
+24÷1
.
3 |
4 |
1 |
4 |
9
5 |
11 |
5 |
11 |
7684×101-7684
9
3 |
5 |
1 |
3 |
1 |
3 |
分析:(1)运用加法结合律简算;
(2)根据减去两个数的和等于连续减去这两个数简算;
(3)运用乘法分配律简算;
(4)同时运算加号左右的除法,再算加法.
(2)根据减去两个数的和等于连续减去这两个数简算;
(3)运用乘法分配律简算;
(4)同时运算加号左右的除法,再算加法.
解答:解:(1)7.86+5
+1.14+
,
=(7.86+1.14)+(5
+
),
=9+6,
=15;
(2)9
-(3.75+4
),
=9
-3.75-4
,
=9
-4
-3.75,
=5-3.75,
=1.25;
(3)7684×101-7684,
=7684×(101-1),
=7684×100,
=768400;
(4)9
÷1
+24÷1
,
=9
×
+24×
,
=7
+18,
=25
.
3 |
4 |
1 |
4 |
=(7.86+1.14)+(5
3 |
4 |
1 |
4 |
=9+6,
=15;
(2)9
5 |
11 |
5 |
11 |
=9
5 |
11 |
5 |
11 |
=9
5 |
11 |
5 |
11 |
=5-3.75,
=1.25;
(3)7684×101-7684,
=7684×(101-1),
=7684×100,
=768400;
(4)9
3 |
5 |
1 |
3 |
1 |
3 |
=9
3 |
5 |
3 |
4 |
3 |
4 |
=7
1 |
5 |
=25
1 |
5 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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