问题 解答题
计算下面各题,怎样简便就怎样算.
1.29+3.7+0.71+6.323.4-8.54-1.466.75×0.5+4.86
19×3.6-3.6×92.5×1.8×0.0410.24÷1.25÷8.
答案

(1)1.29+3.7+0.71+6.3,

=(1.29+0.71)+(3.7+6.3),

=2+10,

=12;

(2)23.4-8.54-1.46,

=23.4-(8.54+1.46),

=23.4-10,

=13.4;

(3)6.75×0.5+4.86,

=3.375+4.86,

=8.235;

(4)19×3.6-3.6×9,

=3.6×(19-9),

=3.6×10,

=36;

(5)2.5×1.8×0.04,

=2.5×0.04×1.8,

=0.1×1.8,

=0.18;

(6)10.24÷1.25÷8,

=10.24÷(1.25×8),

=10.24÷10,

=1.024.

单项选择题
问答题 简答题