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(1)168-52-48,
=168-(52+48),
=168-100,
=68;
(2)125×88,
=125×(80+8),
=125×80+125×8,
=10000+1000,
=11000;
(3)1300÷25÷4,
=1300÷(25×4),
=1300÷100,
=13;
(4)37+125+63+175,
=(37+63)+(125+175),
=100+300,
=400;
(5)75×56-56×28,
=56×(75-28),
=56×47,
=2632;
(6)666-234-166,
=666-(234+166),
=666-400,
=266;
(7)8×29×l25,
=(8×l25)×29,
=1000×29,
=29000;
(8)156×l0l-156,
=156×(l0l-1),
=15600;
(9)404×25,
=(400+4)×25,
=400×25+4×25,
=10000+100,
=10100.