题目内容

能简算的要简算.
4
5
-
4
5
×
5
6
(
3
4
+
5
8
)×32
99×
5
98
10
11
×
1
13
×13×11
(
4
5
+
3
10
10
3
13
49
×21+28×
13
49
分析:(1)(2)(3)(5)(6)根据乘法分配律进行计算;
(4)根据乘法交换律及结合律计算.
解答:解:(1)
4
5
-
4
5
×
5
6

=
4
5
×(1-
5
6

=
4
5
×
1
6

=
2
15


(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44;

(3)99×
5
98

=(98+1)×
5
98

=98×
5
98
+
5
98

=5+
5
98

=5
5
98


(4)
10
11
×
1
13
×13×11
=(
10
11
×11)×(
1
13
×13)
=10×1
=10;

(5)(
4
5
+
3
10
)×
10
3

=
4
5
×
10
3
+
3
10
×
10
3

=2
2
3
+1
=3
2
3


(6)
13
49
×21+28×
13
49

=
13
49
×(21+28)
=
13
49
×49
=13.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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