(1)301×79
=(300+1)×79,
=300×79+1×79,
=23700+79,
=23779;
(2)25×32×125
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)125×88
=125×8×11,
=1000×11,
=11000;
(4)8.59+2.57+3.43+5.47
=8.59+(2.57+3.43)+5.47,
=8.59+6+5.47,
=20.06;
(5)49.62+27.17-19.62
=49.62-19.62+27.17,
=30+27.17,
=57.17;
(6)1546-(546-239)
=1546-546+239,
=1000+239,
=1239.