问题
解答题
用简便方法计算
|
答案
(1)162+72+38,
=(162+38)+72,
=200+72,
=272;
(2)78×5×2,
=78×(5×2),
=78×10,
=780;
(3)125×32,
=(125×8)×4,
=1000×4,
=4000.
用简便方法计算
|
(1)162+72+38,
=(162+38)+72,
=200+72,
=272;
(2)78×5×2,
=78×(5×2),
=78×10,
=780;
(3)125×32,
=(125×8)×4,
=1000×4,
=4000.