问题
解答题
用简便方法计算
|
答案
(1)456+197
=456+200-3,
=656-3,
=653;
(2)157-46-64
=157-(46+64),
=157-110,
=47;
(3)25×16×50
=(25×4)×(4×50),
=100×200,
=20000;
(4)490÷35
=490÷(7×5),
=490÷7÷5,
=70÷5,
=14.
用简便方法计算
|
(1)456+197
=456+200-3,
=656-3,
=653;
(2)157-46-64
=157-(46+64),
=157-110,
=47;
(3)25×16×50
=(25×4)×(4×50),
=100×200,
=20000;
(4)490÷35
=490÷(7×5),
=490÷7÷5,
=70÷5,
=14.