题目内容
计算下面各题,怎样简便怎样计算.
| (
| ||||||||||||||||
| 17.5-17.5÷2.5-3 | 2.92+5.6+4.4+1.08 | ||||||||||||||||
| 720÷(8+4.5)÷8. |
①
÷
-
×
,
=
×
-
×
,
=
-
,
=
-
,
=
;
②(
+
×
)÷
,
=(
+
)×
=
×
,
=
;
③17.5-17.5÷2.5-3,
=17.5-7-3,
=7.5;
④2.92+5.6+4.4+1.08,
=(2.92+1.08)+(5.6+4.4),
=4+10,
=14;
⑤
×
+
×
,
=
×(
+
),
=
×1,
=
;
⑥720÷(8+4.5)÷8,
=720÷12.5÷8,
=720÷(12.5×8),
=720÷100,
=7.2;
| 5 |
| 8 |
| 5 |
| 7 |
| 3 |
| 4 |
| 8 |
| 9 |
=
| 5 |
| 8 |
| 7 |
| 5 |
| 3 |
| 4 |
| 8 |
| 9 |
=
| 7 |
| 8 |
| 2 |
| 3 |
=
| 21 |
| 24 |
| 16 |
| 24 |
=
| 5 |
| 24 |
②(
| 1 |
| 6 |
| 4 |
| 21 |
| 7 |
| 10 |
| 3 |
| 8 |
=(
| 5 |
| 30 |
| 4 |
| 30 |
| 8 |
| 3 |
=
| 3 |
| 10 |
| 8 |
| 3 |
=
| 4 |
| 5 |
③17.5-17.5÷2.5-3,
=17.5-7-3,
=7.5;
④2.92+5.6+4.4+1.08,
=(2.92+1.08)+(5.6+4.4),
=4+10,
=14;
⑤
| 7 |
| 9 |
| 2 |
| 13 |
| 11 |
| 13 |
| 7 |
| 9 |
=
| 7 |
| 9 |
| 2 |
| 13 |
| 11 |
| 13 |
=
| 7 |
| 9 |
=
| 7 |
| 9 |
⑥720÷(8+4.5)÷8,
=720÷12.5÷8,
=720÷(12.5×8),
=720÷100,
=7.2;
练习册系列答案
相关题目