问题
解答题
用简便方法计算
(1)21042-1042
(2)1.42×9-2.32×36.
答案
(1)21042-1042=(2104+104),
=4416000;
(2)1.42×9-2.32×36=1.42×32-2.32×62=4.22-13.82=-172.8.
用简便方法计算
(1)21042-1042
(2)1.42×9-2.32×36.
(1)21042-1042=(2104+104),
=4416000;
(2)1.42×9-2.32×36=1.42×32-2.32×62=4.22-13.82=-172.8.