直接写出得数:
(1)9+99+999+×3=______
(2)5-=______
(3)777×9+111×37-______.
网友回答
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