问题 解答题
神机妙算:
2842÷14+74×3
8
9
÷(
5
6
-
3
4

3.6×99+3.6
3
4
÷(
3
5
×
3
8

4
5
×
6
7
+
1
7
÷
5
4

72×(
5
9
-
5
12
答案

(1)2842÷14+74×3

=2848÷7÷2+74×3,

=203+222,

=425;

(2)

8
9
÷(
5
6
-
3
4

=

8
9
×12,

=10

2
3

(3)3.6×99+3.6

=(99+1)×3.6,

=100×3.6,

=360;

(4)

3
4
÷(
3
5
×
3
8

=

3
4
×
40
9

=

10
3

(5)

4
5
×
6
7
+
1
7
÷
5
4

=

4
5
×
6
7
+
1
7
×
4
5

=(

6
7
+
1
7
)×
4
5

=1×

4
5

=

4
5

(6)72×(

5
9
-
5
12

=72×

5
9
-72×
5
12

=40-30,

=10.

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