(1)8.56×2.7+1.44×2.7,
=(8.56+1.44)×2.7,
=10×2.7,
=27;
(2)1.25×2.5×4×0.8,
=(1.25×0.8)×(2.5×4),
=1×10,
=10;
(3)(1.79+1.2×0.1)÷0.25,
=(1.79+0.12)÷0.25,
=1.91÷0.25,
=7.64;
(4)5.8÷[8×(1.8-1.3)],
=5.8÷[8×0.5],
=5.8÷4,
=1.45.
(1)8.56×2.7+1.44×2.7,
=(8.56+1.44)×2.7,
=10×2.7,
=27;
(2)1.25×2.5×4×0.8,
=(1.25×0.8)×(2.5×4),
=1×10,
=10;
(3)(1.79+1.2×0.1)÷0.25,
=(1.79+0.12)÷0.25,
=1.91÷0.25,
=7.64;
(4)5.8÷[8×(1.8-1.3)],
=5.8÷[8×0.5],
=5.8÷4,
=1.45.