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(2008•邳州市模拟)下面各题怎样简便就怎样算.①4×0.8×2.5×12.5②(2.8+3.85÷3.5)×4.6.

题目详情
(2008•邳州市模拟)下面各题怎样简便就怎样算.
①4×0.8×2.5×12.5
②(2.8+3.85÷3.5)×4.6.
▼优质解答
答案和解析
①4×0.8×2.5×12.5,
=(4×2.5)×(0.8×12.5),
=10×10,
=100;

②(2.8+3.85÷3.5)×4.6,
=(2.8+1.1)×4.6,
=3.9×4.6,
=17.94.