问题 解答题
计算,能简算的要简算:
3
5
×
4
7
×5
4
5
÷[(
1
3
+
2
5
)×
4
11
]
24×(
2
3
+
1
6
-
3
4
100×
100
101
2
3
+
4
15
×
5
6
)÷
20
21
1
1
2
-
5
8
÷
25
28
-
3
10
答案

(1)

3
5
×
4
7
×5,

=

3
5
×5×
4
7

=3×

4
7

=1

5
7

(2)

4
5
÷[(
1
3
+
2
5
)×
4
11
],

=

4
5
÷[
11
15
×
4
11
],

=

4
5
÷
4
15

=3;

(3)24×(

2
3
+
1
6
-
3
4
),

=24×

2
3
+24×
1
6
-24×
3
4

=16+4-18,

=2;

(4)100×

100
101

=101×

100
101
-1×
100
101

=100-

100
101

=99

1
101

(5)(

2
3
+
4
15
×
5
6
)÷
20
21

=(

2
3
+
2
9
)÷
20
21

=

8
9
÷
20
21

=

14
15

(6)1

1
2
-
5
8
÷
25
28
-
3
10

=1

1
2
-
7
10
-
3
10

=1

1
2
-(
7
10
+
3
10
),

=1

1
2
-1,

=

1
2

填空题
解答题