1+999999999999999等于几?

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1+999999999999999等于几?1+999999999999999等于几?1+999999999999999等于几?1+999999999999999=100000000000000015个

1+999999999999999等于几?
1+999999999999999等于几?

1+999999999999999等于几?
1+999999999999999=1000000000000000
15个9 后面是15个0

进1法
1000000000000000