脱式计算(能用简便计算的要用简便计算). 0.25×500×0.2 [16.7-(6.2+9.5)]×8.3 0.9+

2024-11-23 02:49:10
推荐回答(2个)
回答(1):

(1)0.25×500×0.2,
=0.25×(500×0.2),
=0.25×100,
=25;

(2)[16.7-(6.2+9.5)]×8.3,
=[16.7-15.7]×8.3,
=1×8.3,
=8.3;

(3)0.9+99×0.9,
=0.9×(99×1),
=0.9×100,
=90;

(4)10.1×87,
=(10+0.1)×87,
=87×10+0.1×87,
=870+8.7,
=878.7.

回答(2):

16.7×2÷5。简便方法