问题 解答题
找窍门,怎样算简便就怎样算.
(1)
5
6
×
6
5
-
9
10
÷
9
5

(2)4-
5
11
-
7
11

(3)3
1
5
×[(1
2
3
+
1
5
)×2
1
7
]
(4)[
3
4
-0÷(
1
7
+
2
13
)]×1
1
3

(5)20
1
100
×83+1.7×200
1
10

(6)
4
5
÷[(
5
8
-
1
2
)÷
5
8
].
答案

(1)

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
×[(1
2
3
+
1
5
)×2
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
×4,

=12

4
5

(4)[

3
4
-0÷(
1
7
+
2
13
)]×1
1
3

=[

3
4
-0]×
4
3

=

3
4
×
4
3

=1;

(5)20

1
100
×83+1.7×200
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
÷[1-
4
5
],

=

4
5
÷
1
5

=4.

单项选择题
单项选择题