1999+199.9+19.99+1.999
=1999+1+199.9+0.1+19.99+0.01+1.999+0.001-0.001-0.01-0.1-1
=2000+200+20+2-1.111
=2220.889
1999+199.9+19.99+1.999=?
8个回答
相关问题
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1999+199.9+19.99+1.999+0.1999
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1999+199.9+19.99+1.999+0.1999
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0.1999+1.999+19.99+199.9
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1999+199.9+19.99+1.999 简算
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1999+199.9+19.99+1.999=(简便运算)
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巧算∶1.999+19.99+199.9+1999
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1999+199.9+19.99+1.999+2.111简便运算
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√9×9＋19；√99×99＋199； √999×999＋1999 √9999×9999＋19999；
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1999+199.9+19.99+1.999+2.111怎么算简便
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0.1999+1.999+19.99+199.9如何用简便算法算出来