题目内容
直接写得数
|
|
5.6÷0.07= | ||||||||
| 2.7×4×0.25= | 3.3×9.9+0.33= | 9
|
分析:(1)、(2)、(3)根据分数、小数计算法则进行解答即可;
(4)运用乘法结合律,先算4×0.25,然后再用2.7去乘;
(5)3.3×9.9+0.33=(0.33×10)×9.9+0.33=0.33×99+0.33,然后运用乘法分配律提取0.33;
(6)把
拆分为(
+
+
),然后运用加法交换律和加法结合律进行简算.
(4)运用乘法结合律,先算4×0.25,然后再用2.7去乘;
(5)3.3×9.9+0.33=(0.33×10)×9.9+0.33=0.33×99+0.33,然后运用乘法分配律提取0.33;
(6)把
| 1 |
| 3 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
解答:解:(1)
×
=
;
(2)
÷14=
;
(3)5.6÷0.07=80;
(4)2.7×4×0.25=2.7;
(5)3.3×9.9+0.33,
=(0.33×10)×9.9+0.33,
=0.33×99+0.33,
=0.33×(99+1),
=33;
(6)9
+99
+999
+
,
=9
+99
+999
+(
+
+
),
=(9
+
)+(99
+
)+(999
+
),
=10+100+1000,
=1110.
| 11 |
| 24 |
| 8 |
| 33 |
| 1 |
| 9 |
(2)
| 7 |
| 10 |
| 1 |
| 20 |
(3)5.6÷0.07=80;
(4)2.7×4×0.25=2.7;
(5)3.3×9.9+0.33,
=(0.33×10)×9.9+0.33,
=0.33×99+0.33,
=0.33×(99+1),
=33;
(6)9
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 3 |
=9
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
| 1 |
| 9 |
=(9
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
=10+100+1000,
=1110.
点评:完成本题要细心分析式中数据,能简便计算的要简便计算.
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