(1)7.8×10.1,
=7.8×(10+0.1),
=7.8×10+7.8×0.1,
=78+0.78,
=78.78;
(2)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(3)25×(25%+5%),
=25×0.3,
=7.5;
(4)0.25×4+0.25×8,
=1+2,
=3.
(1)7.8×10.1,
=7.8×(10+0.1),
=7.8×10+7.8×0.1,
=78+0.78,
=78.78;
(2)0.125×32×0.25,
=0.125×8×4×0.25,
=(0.125×8)×(4×0.25),
=1×1,
=1;
(3)25×(25%+5%),
=25×0.3,
=7.5;
(4)0.25×4+0.25×8,
=1+2,
=3.