题目内容
(2012?揭东县模拟)用简便方法计算下面各题.
2.7×4.36+2.7×4.64+2.7 | 4.7×
| ||||||||
62
|
2x÷
|
分析:(1)、(2)运用乘法的分配律进行计算即可.
(3)把带分数化成假分数再运用分数乘法的计算法则进行计算即可.
(4)运用等式的性质进行解答即可.
(3)把带分数化成假分数再运用分数乘法的计算法则进行计算即可.
(4)运用等式的性质进行解答即可.
解答:解:(1)2.7×4.36+2.7×4.64+2.7,
=2.7×(4.36+4.64+1),
=2.7×10,
=27;
(2)4.7×
+5.3÷1
-6.5,
=4.7×
+5.3×
-6.5,
=
×(4.7+5.3)-6.5,
=
-6.5,
=7.5-6.5,
=1;
(3)62
×
×36
,
=
×
×
=
,
=
,
=207
;
(4)2x÷
=40,
2x×4=40,
8x=40,
8x÷8=40÷8,
x=5;
=2.7×(4.36+4.64+1),
=2.7×10,
=27;
(2)4.7×
3 |
4 |
1 |
3 |
=4.7×
3 |
4 |
3 |
4 |
=
3 |
4 |
=
30 |
4 |
=7.5-6.5,
=1;
(3)62
1 |
2 |
1 |
11 |
1 |
2 |
=
125 |
2 |
1 |
11 |
73 |
2 |
=
125×73 |
44 |
=
9125 |
44 |
=207
17 |
44 |
(4)2x÷
1 |
4 |
2x×4=40,
8x=40,
8x÷8=40÷8,
x=5;
点评:本题考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算,同时考查了方程的解答情况.
练习册系列答案
相关题目