直接写出得数:(1)947+99112+99989+13×3=______(2)5112-12=______(3)777×9+111×37-______
直接写出得数:(1)947+99112+99989+13×3=______(2)5112-12=______(3)777×9+111×37-______....
直接写出得数:(1)947+99112+99989+13×3=______(2)5112-12=______(3)777×9+111×37-______.
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恶少440
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(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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