第1个回答 2021-03-21
解:19999+9999×9999=100000000
19999+9999×9999
=19999+9999(10000-1)
=19999+99990000-9999
=(19999-9999)+99990000
=10000+99990000
=1000000000
第2个回答 2021-03-21
解,原式=10000+9999+9999x9999
=10000+9999x(1+9999)
=10000+9999x10000
=10000ⅹ(1+9999)
=10000x10000
=100000000
第3个回答 2021-03-21
设a=10000,则
19999+9999×9999
=2a-1+(a-1)(a-1)
=2a-1+a^2-2a+1
=a^2
=100000000.
第4个回答 2021-03-22
=9999*9999+9999+9999+1
=(9999+1)(9999+1)
=10000*10000
=100000000