4.23 *9.9+0.423 简算

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4.23*9.9+0.423简算4.23*9.9+0.423简算4.23*9.9+0.423简算4.23*9.9+0.423=0.423×99+0.423=0.423×100=42.3

4.23 *9.9+0.423 简算
4.23 *9.9+0.423 简算

4.23 *9.9+0.423 简算
4.23 *9.9+0.423
=0.423×99+0.423
=0.423×100
=42.3