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用简便方法计算.8.37×7.2+8.37×2.812.5×3.9×0.81.3+2.9+8.7+0.1.

题目详情
用简便方法计算.
8.37×7.2+8.37×2.8
12.5×3.9×0.8
1.3+2.9+8.7+0.1.
▼优质解答
答案和解析
(1)8.37×7.2+8.37×2.8,
=8.37×(7.2+2.8),
=8.37×10,
=83.7;

(2)12.5×3.9×0.8,
=(12.5×0.8)×3.9,
=100×3.9,
=390;

(3)1.3+2.9+8.7+0.1,
=(1.3+8.7)+(2.9+0.1),
=10+3,
=13.