问题 解答题
计算,能简算的要简算.
5
7
×
4
5
+
2
7
÷
5
4
4
11
×2.5%×165
2
3
-
3
8
÷
1
24
1
2
+29×50%
[1-(
1
4
+
3
8
)]÷
1
3
答案

(1)

5
7
×
4
5
+
2
7
÷
5
4

=

5
7
×
4
5
+
2
7
×
4
5

=(

5
7
+
2
7
)×
4
5

=1×

4
5

=

4
5

(2)

4
11
×2.5%×165,

=

4
11
×165×2.5%,

=60×2.5%,

=1.5;

(3)(

2
3
-
3
8
÷
1
24

=(

2
3
-
3
8
)×24,

=24×

2
3
-
3
8
×24,

=16-9,

=7;

(4)7×

1
2
+29×50%,

=(7+29)×

1
2

=36×

1
2

=18;

(5)[1-(

1
4
+
3
8
)]÷
1
3

=(1-

5
8
)÷
1
3

=

3
8
÷
1
3

=

9
8

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