数学题9999999999乘以9999999999

数学题9999999999乘以9999999999加上19999999999的简便过程怎样

4个回答

=9999999999*(10000000000-1)+19999999999
=99999999990000000000-9999999999+19999999999
=99999999990000000000+10000000000
=100000000000000000000 =1*10的20次方