解:原式=(10000-1)*(10000-1)+19999
=100000000+1-20000+19999
=100000000+1-1
=100000000
这样写肯定对,记得给分哟!
=9999²+19998+1
=9999²+2*9999*1+1
=(9999+1)²
=10000²
=100000000
求采纳为满意回答。
9999*9999+10000+9999=9999*10000+10000=10000*10000=100000000
=9999*9999+9999+10000
=9999*(9999+1)+10000
=9999*10000+10000
=(9999+1)*10000
=10000*10000
=100000000