题目内容
【题目】直接写出得数:
(1)9+99
+999
+
×3=
(2)5﹣
=
(3)777×9+111×37= .
【答案】1109,4
,11100
【解析】
试题分析:(1)9=9+
,99
=99+
,999
=999+
,再根据加法交换律和结合律进行简算;
(2)5=5+
,再根据加法交换律进行计算;
(3)777×9=111×7×9,再根据乘法分配律进行简算.
解:(1)9+99
+999
+
×3,
=(9+)+(99+
)+(999+
)+1,
=(9+99+999+1)+(+
+
),
=1108+1,
=1109;
(2)5﹣
,
=5+﹣
,
=5﹣+
,
=4+
,
=4;
(3)777×9+111×37,
=(111×7)×9+111×37,
=111×63+111×37,
=111×(63+37),
=111×100,
=11100.
故答案为:1109,4
,11100.
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