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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