题目内容
怎样简便就怎样算.
(1)[3.2×(1-
)+
]×
(2)45÷[72×(
-
)]
(3)
÷[(
+
)×
]
(4)4:
-
:4-4
.
(1)[3.2×(1-
| 5 |
| 8 |
| 3 |
| 5 |
| 1 |
| 12 |
(2)45÷[72×(
| 3 |
| 4 |
| 1 |
| 3 |
(3)
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
(4)4:
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
(1)[3.2×(1-
)+
]×
,
=[3.2×
+
]×
,
=[1.2+
]×
,
=1.8×
,
=
;
(2)45÷[72×(
-
)],
=45÷[72×
-72×
],
=45÷[54-24],
=45÷30,
=1.5;
(3)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=5;
(4)4:
-
:4-4
,
=4÷
-
÷4-4
,
=5-
-4
,
=5-(
+4
),
=5-5,
=0.
| 5 |
| 8 |
| 3 |
| 5 |
| 1 |
| 12 |
=[3.2×
| 3 |
| 8 |
| 3 |
| 5 |
| 1 |
| 12 |
=[1.2+
| 3 |
| 5 |
| 1 |
| 12 |
=1.8×
| 1 |
| 12 |
=
| 3 |
| 20 |
(2)45÷[72×(
| 3 |
| 4 |
| 1 |
| 3 |
=45÷[72×
| 3 |
| 4 |
| 1 |
| 3 |
=45÷[54-24],
=45÷30,
=1.5;
(3)
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 3 |
| 13 |
| 15 |
| 1 |
| 13 |
=
| 1 |
| 3 |
| 1 |
| 15 |
=5;
(4)4:
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
=4÷
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
=5-
| 1 |
| 5 |
| 4 |
| 5 |
=5-(
| 1 |
| 5 |
| 4 |
| 5 |
=5-5,
=0.
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