题目内容
口算.
|
|
1÷
|
15×
|
1.25×
| ||||||||||||||
|
|
1.8-40%= | 12×(
|
|
分析:①④约分计算;②③⑦把除法改为乘法,再计算;⑤把小数化为分数,再计算;⑥用分子与整数相乘的积做分子,分母不变;⑧把百分数化为小时,再计算;⑨⑩运用乘法分配律简算.
解答:解:
×
=
;
÷5=
; 1÷
=
; 15×
=4; 1.25×
=
;
×4=
;
÷
=
; 1.8-40%=1.4; 12×(
+
)=19;
×6+4×
=4.
故答案为:
,
,
,4,
,
,
,1.4,19,4.
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 8 |
| 1 |
| 7 |
| 1 |
| 35 |
| 4 |
| 7 |
| 7 |
| 4 |
| 4 |
| 15 |
| 1 |
| 8 |
| 5 |
| 32 |
| 2 |
| 9 |
| 8 |
| 9 |
| 5 |
| 6 |
| 1 |
| 4 |
| 10 |
| 3 |
| 3 |
| 4 |
| 5 |
| 6 |
| 2 |
| 5 |
| 2 |
| 5 |
故答案为:
| 5 |
| 8 |
| 1 |
| 35 |
| 7 |
| 4 |
| 5 |
| 32 |
| 8 |
| 9 |
| 10 |
| 3 |
点评:此题考查了约分计算、乘除法的转化以及运算定律的运用,根据题目特点灵活解答.
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