问题 解答题
能简算的要简算.
4
5
-
2
3
)×15

40%×
1
3
+
2
3
÷
5
2
39×
1
2
×
7
13
0.125×
4
11
+
1
8
÷
11
2
+12.5%×
5
11
答案

(1)(

4
5
-
2
3
)×15,

=

4
5
×15-
2
3
×15,

=12-10,

=2;

(2)40%×

1
3
+
2
3
÷
5
2

=

2
5
×
1
3
+
2
3
×
2
5

=

2
5
×(
1
3
+
2
3
),

=

2
5
×1,

=

2
5

(3)39×

1
2
×
7
13

=(39×

7
13
)×
1
2

=21×

1
2

=

21
2

(4)0.125×

4
11
+
1
8
÷
11
2
+12.5%×
5
11

=0.125×

4
11
+0.125×
2
11
+0.125×
5
11

=0.125×(

4
11
+
2
11
+
5
11
),

=0.125×1,

=0.125.

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