题目内容
(2004?苏州模拟)3.2÷0.01=
1
-(
+
)=
5.6+3.99=
1.7÷2.5=
2×9.9=
+
=
×21=
÷
=
1
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
5.6+3.99=
1.7÷2.5=
2×9.9=
| 2 |
| 3 |
| 1 |
| 4 |
| 19 |
| 20 |
| 6 |
| 5 |
| 5 |
| 6 |
分析:本题根据小数与分数的加法、减法、乘法、除法的运算法则计算即可.其中1
-(
+
)可据一个数减去两个数的和可用这个数分别减这两个数的减法性质去计算.
×21可根据乘法分配律将原式变为
×20+
进行计算.
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
| 19 |
| 20 |
| 19 |
| 20 |
| 19 |
| 20 |
解答:解:3.2÷0.01=320 1
-(
+
)=
5.6+3.99=9.59 1.7÷2.5=0.68
2×9.9=1.98
+
=
×21=19
÷
=
故答案为:320,
,9.59,0.68,1.98,
,19
,
.
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
| 1 |
| 3 |
2×9.9=1.98
| 2 |
| 3 |
| 1 |
| 4 |
| 11 |
| 12 |
| 19 |
| 20 |
| 19 |
| 20 |
| 6 |
| 5 |
| 5 |
| 6 |
| 36 |
| 25 |
故答案为:320,
| 1 |
| 3 |
| 11 |
| 12 |
| 19 |
| 20 |
| 36 |
| 25 |
点评:完成有关于小数的算式时要注意小数点的对齐与小数点位置的变化.
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