a) \(37581-9999\)
\(=37581-9999-1+1\)
\(=37581-10000+1\)
\(=27581+1\)
\(=27582\)
b) \(7345-1998\)
\(=7345-1998-2+2\)
\(=7345-2000+2\)
\(=5345+2\)
\(=5347\)
c) \(485321-99999\)
\(=485321-99999-1+1\)
\(=485321-100000+1\)
\(=385321+1\)
\(=385322\)
d) \(7593-1997\)
\(=7593-1997-3+3\)
\(=7593-2000+3\)
\(=5593+3\)
\(=5596\)