问题 解答题
计算下列各题,能简算的要简算.
3
25
×99+
3
25
4
5
+9×
5
4
48×(
7
12
+
1
4
5
11
×
1
4
÷
5
11
×
1
4
答案

(1)

3
25
×99+
3
25

=

3
25
×(99+1),

=

3
25
×100,

=12;

(2)7÷

4
5
+9×
5
4

=7×

5
4
+9×
5
4

=(7+9)×

5
4

=16×

5
4

=20;

(3)48×(

7
12
+
1
4
),

=48×

7
12
+48×
1
4

=28+12,

=40;

(4)

5
11
×
1
4
÷
5
11
×
1
4

=

5
11
×
1
4
×
11
5
×
1
4

=(

5
11
×
11
5
)×(
1
4
×
1
4
),

=1×

1
16

=

1
16

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