题目内容

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
5
9
×
3
4
+
5
9
×
1
4
( 
3
4
+
5
8
)×32
5
4
×
1
8
×16
1
5
+
2
9
×
3
10
72×
5
71
分析:①②③⑤⑥⑦⑨都可以使用运算定律进行简算,④⑧按计算顺序和计算法则进行计算即可.
解答:解: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,
=3
2
3


13
49
×21+28×
13
49

=(21+28)×
13
49

=49×
13
49

=13;

4
5
-
4
5
×
5
6

=
4
5
-
2
3

=
2
15


5
9
×
3
4
+
5
9
×
1
4

=(
3
4
+
1
4
)×
5
9

=1×
5
9

=
5
9


⑥( 
3
4
+
5
8
)×32,
=
3
4
×32+
5
8
×32,
=24+20,
=44;

5
4
×
1
8
×16,
=
5
4
×(
1
8
×16),
=
5
4
×2,
=
5
2


1
5
+
2
9
×
3
10

=
1
5
+
1
15

=
4
15


⑨72×
5
71

=(71+1)×
5
71

=71×
5
71
+
5
71

=5+
5
71

=5
5
71
点评:计算要细心,同时注意使用运算定律进行简算.
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