50*9.813*0.9+13*0.1如何简便运算,
问题描述:
50*9.813*0.9+13*0.1如何简便运算,
答
寂寞兰博,
50×9.8
=50×(10-0.2)
=50×10-50×0.2
=500-10
=490
13×0.9+13×0.1
=13×(0.9+0.1)
=13×1
=13