问题
解答题
用简便方法计算.
135×50×2
3.6+8.59+6.4
312×4+188×4.
答案
(1)135×50×2,
=135×(50×2),
=135×100,
=13500;
(2)3.6+8.59+6.4,
=(3.6+6.4)+8.59,
=10+8.59,
=18.59;
(3)312×4+188×4,
=(312+188)×4,
=500×4,
=2000.
用简便方法计算.
135×50×2
3.6+8.59+6.4
312×4+188×4.
(1)135×50×2,
=135×(50×2),
=135×100,
=13500;
(2)3.6+8.59+6.4,
=(3.6+6.4)+8.59,
=10+8.59,
=18.59;
(3)312×4+188×4,
=(312+188)×4,
=500×4,
=2000.