题目内容

(2013?黄冈模拟)9999×2222+3333×3334
96%×25+7.5×10%+0.25
666.6×888.8÷(4444×33.33)
1
2
+
1
6
+
1
12
+
1
20
+
1
30

(1+
1
2
)×(1-
1
2
)
×(1+
1
3
)
×(1-
1
3
)
×…×(1+
1
99
)×(1-
1
99
)
分析:(1)变形为3333×6666+3333×3334,再根据乘法分配律简便计算;
(2)变形为96%×25+25×3%+25×0.01,再根据乘法分配律简便计算;
(3)变形为(666.6÷33.33)×(888.8÷4444),求解即可;
(4)先拆分,再抵消简便计算即可;
(5)先计算括号里面的,再约分计算即可.
解答:解:9999×2222+3333×3334,
=3333×6666+3333×3334,
=3333×(6666+3334),
=3333×10000,
=33330000;

96%×25+7.5×10%+0.25,
=96%×25+25×3%+25×0.01,
=(96%+3%+0.01)×25,
=1×25,
=25;

666.6×888.8÷(4444×33.33),
=(666.6÷33.33)×(888.8÷4444),
=20×0.2,
=4;

1
2
+
1
6
+
1
12
+
1
20
+
1
30

=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6

=1-
1
6

=
5
6


(1+
1
2
)×(1-
1
2
)
×(1+
1
3
)
×(1-
1
3
)
×…×(1+
1
99
)×(1-
1
99
)

=
3
2
×
1
2
×
4
3
×
2
3
×…×
100
99
×
98
99

=
1
2
×
100
99

=
50
99
点评:考查了分数的巧算,关键是灵活运用运算定律简便计算.
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