数学题9999999999乘以9999999999加上19999999999的简便过程怎样9999999999X9999999999+19999999999=9999999999平方+2X9999999999+1=(9999999999+1)平方=10000000000平方=10的20次方

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数学题9999999999乘以9999999999加上19999999999的简便过程怎样9999999999X9999999999+19999999999=9999999999平方+2X999999

数学题9999999999乘以9999999999加上19999999999的简便过程怎样9999999999X9999999999+19999999999=9999999999平方+2X9999999999+1=(9999999999+1)平方=10000000000平方=10的20次方
数学题9999999999乘以9999999999加上19999999999的简便过程怎样
9999999999X9999999999+19999999999
=9999999999平方+2X9999999999+1
=(9999999999+1)平方
=10000000000平方
=10的20次方

数学题9999999999乘以9999999999加上19999999999的简便过程怎样9999999999X9999999999+19999999999=9999999999平方+2X9999999999+1=(9999999999+1)平方=10000000000平方=10的20次方
=9999999999*(10000000000-1)+19999999999
=99999999990000000000-9999999999+19999999999
=99999999990000000000+10000000000
=100000000000000000000 =1*10的20次方

=9999999999*(10000000000-1)+19999999999
=99999999990000000000-9999999999+19999999999
=99999999990000000000+10000000000
=100000000000000000000

原式=9999999999*10000000000+(9999999999-9999999999)

答案在0-正无穷之间 且是自然数