问题标题:
求一道数学题(过程)简便方法3.6x31.4+43.9x6.420.05x39+200.5x4.1+40x10.05
问题描述:
求一道数学题(过程)简便方法
3.6x31.4+43.9x6.4
20.05x39+200.5x4.1+40x10.05
卢道全回答:
3.6x31.4+43.9x6.4=3.6x31.4+31.4x6.4+12.5x6.4=31.4x(3.6+6.4)+12.5x8x0.8=314+100x0.8=314+80=39420.05x39+200.5x4.1+40x10.05=20.05x39+20.05x41+40x20.05-40x10=20.05x(39+41+40)-400=20.05x120-400=2005+20.0...
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