(1)2.5×12.5×32
=(2.5×4)×(12.5×8),
=10×100,
=1000;
(2)1375+450÷18×25
=1375+25×25,
=1375+625,
=2000;
(3)
5
6]×0.25+[1/4]×[1/6]
=0.25×([5/6]+[1/6]),
=0.25;
(4)[2/3]×[([5/8]+0.75)÷[5/8]]
=[2/3]×[[5/8]÷[5/8]+[3/4]÷[5/8]],
=[2/3]×[1+[6/5]],
=[2/3]×[11/5],
=[22/15].