题目内容
找窍门,怎样算简便就怎样算.
(1)
×
-
÷
(2)4-
-
(3)3
×[(1
+
)×2
]
(4)[
-0÷(
+
)]×1
(5)20
×83+1.7×200
(6)
÷[(
-
)÷
].
(1)
| 5 |
| 6 |
| 6 |
| 5 |
| 9 |
| 10 |
| 9 |
| 5 |
(2)4-
| 5 |
| 11 |
| 7 |
| 11 |
(3)3
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
(4)[
| 3 |
| 4 |
| 1 |
| 7 |
| 2 |
| 13 |
| 1 |
| 3 |
(5)20
| 1 |
| 100 |
| 1 |
| 10 |
(6)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
(1)
×
-
÷
=1-
×
,
=1-
,
=
;
(2)4-
-
=4-(
+
),
=4-1,
=3;
(3)3
×[(1
+
)×2
]
=
×[(
+
)×
],
=
×[
×
+
×
],
=
×[
+
],
=
×4,
=12
;
(4)[
-0÷(
+
)]×1
=[
-0]×
,
=
×
,
=1;
(5)20
×83+1.7×200
=20.01×83+1.7×200.1
=200.1×8.3+1.7×200.1,
=(8.3+1.7)×200.1,
=10×200.1,
=2001;
(6)
÷[(
-
)÷
]
=
÷[(
-
)×
],
=
÷[
×
-
×
],
=
÷[1-
],
=
÷
,
=4.
| 5 |
| 6 |
| 6 |
| 5 |
| 9 |
| 10 |
| 9 |
| 5 |
=1-
| 9 |
| 10 |
| 5 |
| 9 |
=1-
| 1 |
| 2 |
=
| 1 |
| 2 |
(2)4-
| 5 |
| 11 |
| 7 |
| 11 |
=4-(
| 5 |
| 11 |
| 7 |
| 11 |
=4-1,
=3;
(3)3
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 7 |
=
| 16 |
| 5 |
| 5 |
| 3 |
| 1 |
| 5 |
| 15 |
| 7 |
=
| 16 |
| 5 |
| 5 |
| 3 |
| 15 |
| 7 |
| 1 |
| 5 |
| 15 |
| 7 |
=
| 16 |
| 5 |
| 25 |
| 7 |
| 3 |
| 7 |
=
| 16 |
| 5 |
=12
| 4 |
| 5 |
(4)[
| 3 |
| 4 |
| 1 |
| 7 |
| 2 |
| 13 |
| 1 |
| 3 |
=[
| 3 |
| 4 |
| 4 |
| 3 |
=
| 3 |
| 4 |
| 4 |
| 3 |
=1;
(5)20
| 1 |
| 100 |
| 1 |
| 10 |
=20.01×83+1.7×200.1
=200.1×8.3+1.7×200.1,
=(8.3+1.7)×200.1,
=10×200.1,
=2001;
(6)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 8 |
| 5 |
=
| 4 |
| 5 |
| 5 |
| 8 |
| 8 |
| 5 |
| 1 |
| 2 |
| 8 |
| 5 |
=
| 4 |
| 5 |
| 4 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
=4.
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