3.43-2.1+5.58简算?
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解:简便计算过程如下
3.43-2.1+5.58
=3.42+5.58-2.1+0.01
=9-2.1+0.01
=6.9+0.01
=6.91
3.43-2.1+5.58
=3.42+5.58-2.1+0.01
=9-2.1+0.01
=6.9+0.01
=6.91
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3.43-2.1+5.58
=3.01+0.42+5.58-2.1
=3.01+6-2.1
=9.01-2-0.1
=7.01-0.1
=6.91
=3.01+0.42+5.58-2.1
=3.01+6-2.1
=9.01-2-0.1
=7.01-0.1
=6.91
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原式=3.43+5.58-2-0.1
=9-2-0.1
=7-0.1
=6.9
=9-2-0.1
=7-0.1
=6.9
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