问题 解答题
能简算的要简算
10
11
×
1
13
×13×11
4
5
+
3
10
)×
10
3
13
49
×21+28×
13
49
4
5
-
4
5
×
5
6
3
4
+
5
8
)×32
99×
5
98
答案

(1)

10
11
×
1
13
×13×11,

=(

10
11
×11)×(
1
13
×13),

=10×1,

=10;

(2)(

4
5
+
3
10
)×
10
3

=

4
5
×
10
3
+
3
10
×
10
3

=

8
3
+1,

=

11
3

(3)

13
49
×21+28×
13
49

=

13
49
×(21+28),

=

13
49
×49,

=13;

(4)

4
5
-
4
5
×
5
6

=

4
5
×(1-
5
6
),

=

4
5
×
1
6

=

2
15

(5)(

3
4
+
5
8
)×32,

=

3
4
×32+
5
8
×32,

=24+20,

=44;

(6)99×

5
98

=(98+1)×

5
98

=98×

5
98
+1×
5
98

=5+

5
98

=5

5
98

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