题目内容
用简便方法计算下面各题.
4.7×
+5.3÷1
-6.5=
2.7×4.36+2.7×4.64+2.7=
62
×
+
×36
=
4.7×
3 |
4 |
1 |
3 |
2.7×4.36+2.7×4.64+2.7=
62
1 |
2 |
1 |
11 |
1 |
11 |
1 |
2 |
分析:(1)4.7×
+5.3÷1
-6.5,把
化成小数是0.75,把除数1
转化为乘它的倒数,再运用乘法分配律进行简算;
(2)2.7×4.36+2.7×4.64+2.7,运用乘法分配律进行简算;
(3)62
×
+
×36
,运用乘法分配律进行简算.
3 |
4 |
1 |
3 |
3 |
4 |
1 |
3 |
(2)2.7×4.36+2.7×4.64+2.7,运用乘法分配律进行简算;
(3)62
1 |
2 |
1 |
11 |
1 |
11 |
1 |
2 |
解答:解:(1)4.7×
+5.3÷1
-6.5,
=4.7×
+5.3×
-6.5,
=(4.7+5.3)×0.75-6.5,
=10×0.75-6.5,
=7.5-6.5,
=1;
(2)2.7×4.36+2.7×4.64+2.7,
=2.7×(4.36+4.64+1),
=2.7×10,
=27;
(3)62
×
+
×36
,
=(62
+36
)×
,
=99×
,
=9.
3 |
4 |
1 |
3 |
=4.7×
3 |
4 |
3 |
4 |
=(4.7+5.3)×0.75-6.5,
=10×0.75-6.5,
=7.5-6.5,
=1;
(2)2.7×4.36+2.7×4.64+2.7,
=2.7×(4.36+4.64+1),
=2.7×10,
=27;
(3)62
1 |
2 |
1 |
11 |
1 |
11 |
1 |
2 |
=(62
1 |
2 |
1 |
2 |
1 |
11 |
=99×
1 |
11 |
=9.
点评:此题考查的目的是理解掌握乘法分配律的意义,并且能够灵活运用乘法分配律进行简便计算.
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