算式的简便算法3.9+0.39+0.039+0.0039+0.00039的简便算法快,用递等式,如:98+998+999
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算式的简便算法
3.9+0.39+0.039+0.0039+0.00039的简便算法
快,用递等式,如:
98+998+9998
=100+1000+10000+2*5
=1111100-10
=1111090
3.9+0.39+0.039+0.0039+0.00039的简便算法
快,用递等式,如:
98+998+9998
=100+1000+10000+2*5
=1111100-10
=1111090
![算式的简便算法3.9+0.39+0.039+0.0039+0.00039的简便算法快,用递等式,如:98+998+999](/uploads/image/z/6413306-50-6.jpg?t=%E7%AE%97%E5%BC%8F%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%953.9%2B0.39%2B0.039%2B0.0039%2B0.00039%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%E5%BF%AB%2C%E7%94%A8%E9%80%92%E7%AD%89%E5%BC%8F%2C%E5%A6%82%EF%BC%9A98%2B998%2B999)
3.9+0.39+0.039+0.0039+0.00039
=4-0.1+0.4-0.01+0.04-0.001+0.004-0.0001+0.0004-0.00001
=4.4444-0.11111
=4.3333-0.00001
=4.33329
=4-0.1+0.4-0.01+0.04-0.001+0.004-0.0001+0.0004-0.00001
=4.4444-0.11111
=4.3333-0.00001
=4.33329