直接写出得数:(1)947+99112+99989+13×3=______(2)5112-12=______(3)777×9+111×37-______.-数学
题文
直接写出得数: (1)9
(2)5
(3)777×9+111×37-______. |
答案
(1)9
=(9+
=(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 |