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请高手帮忙解答0.9999*0.6+0.1111*0.36

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请高手帮忙解答0.9999*0.6+0.1111*0.36
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答案和解析
0.9999*0.6+0.1111*0.36
=0.9999*0.6+0.1111*9*0.04
=0.9999*0.6+0.9999*0.04
=0.9999*0.64
=(1-0.0001)*0.64
=0.64-0.000064
=0.639936