问题
解答题
(1)505+298
(2)198×8
(3)242÷60.
答案
(1)505+298,
=505+300-2,
=805-2,
=803;
(2)198×8,
=(200-2)×8,
=200×8-2×8,
=1600-16,
=1584;
(3)242÷60=4…2.
(1)505+298
(2)198×8
(3)242÷60.
(1)505+298,
=505+300-2,
=805-2,
=803;
(2)198×8,
=(200-2)×8,
=200×8-2×8,
=1600-16,
=1584;
(3)242÷60=4…2.