(1)480-48+124,
=432+124,
=556;
(2)1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;
(3)(
+7 23
)×3+1 3
,2 23
=
×3+7 23
×3+1 3
,2 23
=(
+21 23
)+1,2 23
=1+1,
=2;
(4)(
-2 3
)×30,2 5
=
×30-2 3
×30,2 5
=20-12,
=8;
(5)3.45÷[0.3×(2.3-1.8)],
=3.45÷[0.3×0.5],
=3.45÷0.15,
=23;
(6)
×[(2 3
-1 3
)÷1 5
],4 5
=
×[2 3
÷2 15
],4 5
=
×2 3
,1 6
=
.1 9