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
3
4
+
5
8
)×32
99×
5
98
分析:(1)根据乘法交换律和结合律进行计算;
(2)、(3)、(4)、(5)、(6)根据乘法分配律进行即可.
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,
=
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
点评:考查了运算定律与简便运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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