问题
解答题
计算下面各题,怎样简便就怎样算.
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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.