试题:
阅读下列计算过程: 9×9+19=92+2×9+1=(9+1)2=102 99×99+199=992+2×99+1=(99+1)2=1002=104 计算:999×999+1999=______=______=______=______ 9999×9999+19999=______=______=______=______ 猜想:
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