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+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
).
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 |
2 |
1 |
3 |
1 |
3 |
1 |
99 |
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.
(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-
+
-
+
-
+
-
+
-
,
=1-
,
=
;
(1+
)×(1-
)×(1+
)×(1-
)×…×(1+
)×(1-
)
=
×
×
×
×…×
×
=
×
,
=
.
=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 |
2 |
1 |
3 |
1 |
3 |
1 |
99 |
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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