3个回答
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解:∵6个9
= 9 + 9 + 9 + 9 + 9 + 9
= 6 × 9
= 54
7个9
= 9 + 9 + 9 + 9 + 9 + 9 + 9
= 7 × 9
= 63
5个9
= 9 + 9 + 9 + 9 + 9
= 5 × 9
= 45
∴6个9比7个9少的数
= 7 × 9 - 6 × 9
= 63 - 54
= 9
6个9比5个9多的数
= 6 × 9 - 5 × 9
= 54 - 45
= 9
答:(1)6个9比7个9少9(2)6个9比5个9多9
= 9 + 9 + 9 + 9 + 9 + 9
= 6 × 9
= 54
7个9
= 9 + 9 + 9 + 9 + 9 + 9 + 9
= 7 × 9
= 63
5个9
= 9 + 9 + 9 + 9 + 9
= 5 × 9
= 45
∴6个9比7个9少的数
= 7 × 9 - 6 × 9
= 63 - 54
= 9
6个9比5个9多的数
= 6 × 9 - 5 × 9
= 54 - 45
= 9
答:(1)6个9比7个9少9(2)6个9比5个9多9
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