A-A+
递等式计算.(能用简便方法的要用简便方法计算)38×1114+314×3849+311+59
问题详情
参考答案
(1)38×1114+314×38
=(1114+314)×38
=1×38
=38;
(2)49+311+59+111
=(49+59)+(311+111)
=1+411
=1411;
(3)57×1415×1021=2063;
(4)101×38-38
=(101-1)×38
=100×38
=752;
(5)551×52
=551×(51+1)
=551×51+551
=5+551
=5551;
(6)29×51×9×1217
=(29×9)×(51×1217)
=2×36
=72.
考点:方法,等式