(1)6.7+25+3.3+75
=(6.7+3.3)+(25+75),
=10+100,
=110;
(2)103×12
=(100+3)×12,
=100×12+3×12,
=1200+36,
=1236;
(3)14.85-(4.85+2.5)
=14.85-4.85-2.5,
=10-2.5,
=7.5;
(4)15×99+15
=(99+1)×15,
=100×15,
=1500;
(5)9.14-1.43-4.57
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(6)2000÷125÷8
=2000÷(125×8),
=2000÷1000,
=2.