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9.9^2-9.9×0.2＋0.01简便计算

2025-03-25 18:14:42

推荐回答（4个）

回答1：

9.9²＋0.2×9.9＋0.01
=9.9²＋2×9.9×0.1＋0.1²
=(9.9＋0.1)²
=10²
=100

9.9²－0.2×9.9＋0.01
=9.9²－2×9.9×0.1＋0.1²
=(9.9－0.1)²
=9.8²
=96.04

回答2：

解：9.9²－0.2×9.9＋0.01
=9.9²－2×9.9×0.1＋0.1²
=(9.9－0.1)²
=(10－0.8)²
=10²－2×10×0.2＋0.2²
=100-4+0.04
=96.04

回答3：

9.9²－0.2×9.9＋0.01
=9.9²－2×9.9×0.1＋0.1²
=(9.9－0.1)²
=(10－0.2)²
=10²－2×10×0.2＋0.2²
=100-4+0.04
=96.04

回答4：

9.9²－0.2×9.9＋0.01
=9.9²－2×9.9×0.1＋0.1²
=(9.9－0.1)²
=9.8²
=96.04

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