(1)25×44,
=25×4×11,
=100×11,
=1100;
(2)10-(4+0.05),
=10-4.05,
=5.95;
(3)2.32-1.5+3.68-2.5,
=(2.32+3.68)-(1.5+2.5),
=6-4,
=2;
(4)420+28=448;
(5)(4800÷75+36)×12,
=(64+36)×12,
=100×12,
=1200;
(6)(2007+2007+2007+2007)×25,
=(2007×4)×25,
=2007×(4×25),
=2007×100,
=200700.