(1)916-816÷48×8,
=916-17×8,
=916-136,
=780;
(2)73×2.87+2.87×26+2.87,
=(73+26)×2.87,
=100×2.87,
=287;
(3)1.56÷0.24×(7-6.8),
=6.5×0.2,
=1.3;
(4)0.9×[0.8-(0.2÷0.5+0.3)],
=0.9×[0.8-(0.4+0.3)],
=0.9×[0.8-0.7],
=0.9×0.1,
=0.09;
(5)abc=2.5×9×0.4,
=(2.5×0.4)×9,
=1×9
=9.