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用简便方法计算.1.8×25%+2.2×25%4.62+9.999×0.6+0.6.

题目详情
用简便方法计算.
1.8×25%+2.2×25%        
4.62+9.9          99×0.6+0.6.
▼优质解答
答案和解析
(1)1.8×25%+2.2×25%,
=(1.8+2.2)×0.25,
=4×0.25,
=1;

(2)4.62+9.9,
=4.62+(10-0.1),
=4.62+10-0.1,
=14.62-0.1,
=14.61;

(3)99×0.6+0.6,
=(99+1)×0.6,
=100×0.6,
=60.