题目内容
| 下面各题怎样算简便就怎样算. (1)
| (2)0.8+
| (3)(
| ||||||||||||||||||
(4)
| (5)(0.25+
| (6)
|
(1)
×
÷
,
=
×
×
,
=
;
(2)0.8+
÷
,
=0.8+0.6,
=1.4;
(3)(
+
)×56,
=56×
+
×56,
=32+21,
=53;
(4)
+
+
×
,
=
+
+
,
=
+
,
=
;
(5)(0.25+
)×(1.6÷
),
=
×2,
=
;
(6)
×[1÷(
+
)],
=
×(1÷
),
=
×
,
=
.
| 4 |
| 9 |
| 9 |
| 14 |
| 4 |
| 21 |
=
| 4 |
| 9 |
| 9 |
| 14 |
| 21 |
| 4 |
=
| 3 |
| 2 |
(2)0.8+
| 1 |
| 2 |
| 5 |
| 6 |
=0.8+0.6,
=1.4;
(3)(
| 4 |
| 7 |
| 3 |
| 8 |
=56×
| 4 |
| 7 |
| 3 |
| 8 |
=32+21,
=53;
(4)
| 3 |
| 8 |
| 4 |
| 7 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 8 |
| 4 |
| 7 |
| 1 |
| 10 |
=
| 53 |
| 56 |
| 1 |
| 10 |
=
| 293 |
| 280 |
(5)(0.25+
| 1 |
| 3 |
| 4 |
| 5 |
=
| 7 |
| 12 |
=
| 7 |
| 6 |
(6)
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 19 |
| 12 |
=
| 3 |
| 4 |
| 12 |
| 19 |
=
| 9 |
| 19 |
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