速度解答`,初一数学999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)

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速度解答`,初一数学999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)
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速度解答`,初一数学999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)
速度解答`,初一数学
999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)

速度解答`,初一数学999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)
999````````9(n个9)×999```````9(n个9)+1 999``````9(n个9)=999````````9(n个9)×999```````9(n个9)+1000...0(n个0)+999``````9(n个9)
=1000...0(n个0)×999````````9(n个9)+1000...0(n个0)
=1000...0(n个0)×1000...0(n个0)
=1000...0(2n个0)