问题 解答题
简算.
23×
13
22
7
16
×40-
5
16
÷
1
40
3
4
×46.7+52.3×
3
4
+
3
4
4
17
+
1
25
)×17×25.
答案

(1)23×

13
22

=(22+1)×

13
22

=22×

13
22
+1×
13
22

=13+

13
22

=13

13
22

(2)

7
16
×40-
5
16
÷
1
40

=

7
16
×40-
5
16
×40,

=(

7
16
-
5
16
)×40,

=

1
8
×40,

=5;

(3)

3
4
×46.7+52.3×
3
4
+
3
4

=

3
4
×(46.7+52.3+1),

=

3
4
×100,

=75;

(4)(

4
17
+
1
25
)×17×25,

=(

4
17
+
1
25
)×(17×25),

=(

4
17
×17×25)+(
1
25
×25×17),

=(4×25)+(1×17),

=100+17,

=117.

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