(1)3+1.5÷2.5÷4,
=3+0.6÷4,
=3+0.15,
=3.15;
(2)8-4.4×0.25,
=8-1.1,
=6.9;
(3)120+600÷24,
=120+25,
=145;
(4)
×6÷3 5
,2 15
=
×18 5
,15 2
=27;
(5)(
-10 11
)×11×6,5 6
=
×11×6-10 11
×11×6,5 6
=60-55,
=5;
(6)
÷(1 6
-3 4
)÷1 3
,4 5
=
÷(1 6
-9 12
)×4 12
,5 4
=
÷1 6
×5 12
,5 4
=
×1 6
×12 5
,5 4
=
;1 2