题目内容
(2012?道真县)计算,能简算的要简算
+
+6.875+
×
+
÷
64×3.75+3.75×36
(
+
)×13×29.
1 |
8 |
5 |
7 |
2 |
7 |
1 |
4 |
4 |
5 |
9 |
10 |
9 |
20 |
64×3.75+3.75×36
(
3 |
29 |
1 |
13 |
分析:(1)先将6.875转化成分数,即6
,再利用加法交换律交换加数的位置进行计算即可;
(2)根据分数的四则混合运算进行计算即可;
(3)根据乘法分配律进行计算比较简便;
(4)根据乘法分配律进行计算比较简便.
7 |
8 |
(2)根据分数的四则混合运算进行计算即可;
(3)根据乘法分配律进行计算比较简便;
(4)根据乘法分配律进行计算比较简便.
解答:解:(1)
+
+6.875+
=(
+6
)+(
+
),
=7
+1,
=8
;
(2)
×
+
÷
=
+
×
,
=
+2,
=2
;
(3)64×3.75+3.75×36
=3.75×(64+36),
=3.75×100,
=375;
(4)(
+
)×13×29
=
×13×29+
×13×29,
=39+29,
=68.
7 |
8 |
5 |
7 |
2 |
7 |
=(
7 |
8 |
7 |
8 |
5 |
7 |
2 |
7 |
=7
3 |
4 |
=8
3 |
4 |
(2)
1 |
4 |
4 |
5 |
9 |
10 |
9 |
20 |
=
1 |
5 |
9 |
10 |
20 |
9 |
=
1 |
5 |
=2
1 |
5 |
(3)64×3.75+3.75×36
=3.75×(64+36),
=3.75×100,
=375;
(4)(
3 |
29 |
1 |
13 |
=
3 |
29 |
1 |
13 |
=39+29,
=68.
点评:此题主要考查分数和小数的四则混合运算和简便运算.
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