题目内容

简算.
5
18
×3+
5
18
×5+
5
18
×10
999×7+111×7
97×
5
96
1
2
+
1
7
+
1
11
+
1
13
)×2002
8.5×
3
4
+0.75×5+6.5÷1
1
3
4
5
+9
4
5
+99
4
5
+999
4
5
+9999
4
5
分析:(1)、(2)、(3)、(4)利用乘法的分配律解答;
(5)把8.5×
3
4
+0.75×5+6.5÷1
1
3
转化为8.5×
3
4
+
3
4
×5+6.5×
3
4
,再利用乘法的分配律解答;
(6)将给出的式子加5个
1
5
,再减去1即可.
解答:
解:(1)
5
18
×3+
5
18
×5+
5
18
×10,
=
5
18
×(3+5+10),
=
5
18
×18,
=5;(2)999×7+111×7,
=7×(999+111),
=7×1110,
=7770,

(3)97×
5
96

=(96+1)×
5
96

=96×
5
96
+1×
5
96

=5+
5
96

=5
5
96


(4)(
1
2
+
1
7
+
1
11
+
1
13
)×2002,
=
1
2
×2002+
1
7
×2002+
1
11
×2002+
1
13
×2002;
=1001+286+182+154,
=1623;

(5)8.5×
3
4
+0.75×5+6.5÷1
1
3

=8.5×
3
4
+
3
4
×5+6.5×
3
4

=
3
4
×(8.5+5+6.5),
=
3
4
×20,
=15;

(6)
4
5
+9
4
5
+99
4
5
+999
4
5
+9999
4
5

=
4
5
+
1
5
+9
4
5
+
1
5
+99
4
5
+
1
5
+999
4
5
+
1
5
+9999
4
5
+
1
5
-1,
=1+10+100+1000+10000-1,
=11110.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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