999999999999999999999*999999999999999999999+1999999999999999999999=？
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999999999999999999999x999999999999999999999 1999999999999999999999
=（1000000000000000000000-1）2 +2000000000000000000000-1
= 1000000000000000000000 2 -2000000000000000000000 +1 +2000000000000000000000-1
= 10的42次
=（1000000000000000000000-1）2 +2000000000000000000000-1
= 1000000000000000000000 2 -2000000000000000000000 +1 +2000000000000000000000-1
= 10的42次
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9*9+19=100
99*99+199=10000
999999999999999999999*999999999999999999999+1999999999999999999999
=999999999999999999999*999999999999999999999+999999999999999999999+1000000000000000000000
=999999999999999999999*（999999999999999999999+1）+1000000000000000000000
=999999999999999999999*1000000000000000000000
+1000000000000000000000
=1000000000000000000000*1000000000000000000000
=1000000000000000000000000000000000000000000
99*99+199=10000
999999999999999999999*999999999999999999999+1999999999999999999999
=999999999999999999999*999999999999999999999+999999999999999999999+1000000000000000000000
=999999999999999999999*（999999999999999999999+1）+1000000000000000000000
=999999999999999999999*1000000000000000000000
+1000000000000000000000
=1000000000000000000000*1000000000000000000000
=1000000000000000000000000000000000000000000
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