题目内容
脱式计算,能简算的必须简算,并写出主要过程.
808×1.25
8.6×[1÷(12.1-12.09)]
+(
-
)×
9
×3.8+
×9.5.
808×1.25
8.6×[1÷(12.1-12.09)]
| 8 |
| 15 |
| 4 |
| 7 |
| 1 |
| 2 |
| 14 |
| 25 |
9
| 1 |
| 2 |
| 1 |
| 5 |
(1)808×1.25,
=(800+8)×1.25,
=800×1.25+8×1.25,
=1000+10,
=1010;
(2)8.6×[1÷(12.1-12.09)],
=8.6×[1÷0.01],
=8.6×100,
=860;
(3)
+(
-
)×
,
=
+
×
,
=
+
,
=
;
(4)9
×3.8+
×9.5,
=9
×(3.8+0.2),
=9
×4,
=38.
=(800+8)×1.25,
=800×1.25+8×1.25,
=1000+10,
=1010;
(2)8.6×[1÷(12.1-12.09)],
=8.6×[1÷0.01],
=8.6×100,
=860;
(3)
| 8 |
| 15 |
| 4 |
| 7 |
| 1 |
| 2 |
| 14 |
| 25 |
=
| 8 |
| 15 |
| 1 |
| 14 |
| 14 |
| 25 |
=
| 8 |
| 15 |
| 1 |
| 25 |
=
| 43 |
| 75 |
(4)9
| 1 |
| 2 |
| 1 |
| 5 |
=9
| 1 |
| 2 |
=9
| 1 |
| 2 |
=38.
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