问题
解答题
用简便方法计算:
25×14×4
83×5+5×17
15.64-2.53-7.47.
答案
(1)25×14×4,
=25×4×14,
=100×14,
=1400;
(2)83×5+5×17,
=(83+17)×5,
=100×5,
=500;
(3)15.64-2.53-7.47,
=15.64-(2.53+7.47),
=15.64-10,
=5.64.
用简便方法计算:
25×14×4
83×5+5×17
15.64-2.53-7.47.
(1)25×14×4,
=25×4×14,
=100×14,
=1400;
(2)83×5+5×17,
=(83+17)×5,
=100×5,
=500;
(3)15.64-2.53-7.47,
=15.64-(2.53+7.47),
=15.64-10,
=5.64.