问题标题:
【0.999加0.999加0.099加0.009加0.004怎么巧算】
问题描述:
0.999加0.999加0.099加0.009加0.004怎么巧算
尚文倩回答:
0.999+0.999+0.099+0.009+0.004
=(1-0.001)+(1-0.001)+(0.1-0.001)+(0.01-0.001)+0.004
=1+1+0.1+0.01-(0.001+0.001+0.001+0.001)+0.004
=2.2-0.004+0.004
=2.2
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