2006分之2005乘1999等于多少?567乘345加222分之567加345乘566等于多少?

2005/2006×1999
=(1-1/2006)×1999
=1×1999-1/2006×1999
=1999-1999/2006
=1998+1-1999/2006
=1998又2006分之7
(567+345×566)/(567×345+222)
=[567+345×(567-1)]/(567×345+222)
=(567+345×567-345×1)/(567×345+222)
=(345×567+222)/(567×345+222)
=1