题目内容
用简便方法计算.
+
+
-(
+
)
3.7×65+3.7×35.
| 3 |
| 8 |
| 4 |
| 7 |
| 5 |
| 8 |
| 9 |
| 7 |
| 2 |
| 7 |
| 1 |
| 8 |
3.7×65+3.7×35.
考点:分数的简便计算,运算定律与简便运算
专题:运算定律及简算
分析:(1)利用加法结合律计算即可.
(2)运用a-(b+c)=a-b-c计算即可;
(3)运用乘法分配律简算.
(2)运用a-(b+c)=a-b-c计算即可;
(3)运用乘法分配律简算.
解答:
解:
①
+
+
=
+
+
=1+
=1
②
-(
+
)
=
-
-
=1-
=
③3.7×65+3.7×35
=3.7×(65+35)
=3.7×100
=370
①
| 3 |
| 8 |
| 4 |
| 7 |
| 5 |
| 8 |
=
| 3 |
| 8 |
| 5 |
| 8 |
| 4 |
| 7 |
=1+
| 4 |
| 7 |
=1
| 4 |
| 7 |
②
| 9 |
| 7 |
| 2 |
| 7 |
| 1 |
| 8 |
=
| 9 |
| 7 |
| 2 |
| 7 |
| 1 |
| 8 |
=1-
| 1 |
| 8 |
=
| 7 |
| 8 |
③3.7×65+3.7×35
=3.7×(65+35)
=3.7×100
=370
点评:本题主要考查了学生在四则混合运算中灵活运用简便算法的计算能力.
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