题目内容

25×1.25×321
8
13
×
13
42
+5
1
5
÷
4
5
5
21
×
3
4
+
3
4
×2
16
21
+
3
4
1
5
÷2.4×
2
3
÷
4
7
5
11
×34×12
1
10
×
2
51
1
1
2
÷(1
1
4
÷1
1
6
)

(1)25×1.25×32,
=25×1.25×(4×8),
=(25×4)×(1.25×8),
=100×10,
=1000;

(2)1
8
13
×
13
42
+5
1
5
÷
4
5

=
1
2
+
13
2

=7;

(3)
5
21
×
3
4
+
3
4
×2
16
21
+
3
4

=(
5
21
+2
16
21
+1)×
3
4

=4×
3
4

=3;

(4)
1
5
÷2.4×
2
3
÷
4
7

=
1
12
×
2
3
÷
4
7

=
1
18
÷
4
7

=
7
72


(5)
5
11
×34×12
1
10
×
2
51

=(
5
11
×12
1
10
)×(34×
2
51
),
=
11
2
×
4
3

=
22
3


(6)1
1
2
÷(1
1
4
÷1
1
6
)

=1
1
2
÷
15
14

=
7
5
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