试题与答案

计算下面各题,注意使用简便算法.73×57÷13420×(37+56)425×9

题型:解答题

题目:

计算下面各题,注意使用简便算法.
7
3
×
5
7
÷
1
3

420×(
3
7
+
5
6

4
25
×99+
4
25

5
9
×7+
5
9
×11.

答案:

(1)

7
3
×
5
7
÷
1
3

=

7
3
×
5
7
×3,

=5;

(2)420×(

3
7
+
5
6
),

=420×

3
7
+420×
5
6

=180+350,

=530;

(3)

4
25
×99+
4
25

=

4
25
×(99+1),

=

4
25
×100,

=16;

(4)

5
9
×7+
5
9
×11,

=

5
9
×(7+11),

=

5
9
×18,

=10.

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