题目内容
| 合理、灵活地计算. 85×
|
| ||||||||
(2-0.6)÷
| 2-
| ||||||||
(
|
(1)85×
,
=(86-1)×
,
=86×
-1×
,
=3-
,
=2
;
(2)
×
+
÷6,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)(2-0.6)÷
,
=1.4×
,
=3;
(4)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0;
(5)(
+
)÷
,
=
×24,
=31.
| 3 |
| 86 |
=(86-1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3-
| 3 |
| 86 |
=2
| 83 |
| 86 |
(2)
| 5 |
| 6 |
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 6 |
| 5 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 5 |
| 9 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(3)(2-0.6)÷
| 7 |
| 15 |
=1.4×
| 15 |
| 7 |
=3;
(4)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0;
(5)(
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 24 |
=
| 31 |
| 24 |
=31.
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