(1)(12.5-7.6)×(3-2.8),
=4.9×0.2,
=0.98;
(2)7.8×101-7.8,
=7.8×(100-1),
=7.8×100,
=780;
(3)7×(
+4 7
)×11,10 11
=7××11×
+7×11×4 7
,10 11
=44+70,
=114;
(4)
÷[8 15
×(1 4
-8 9
)],16 45
=
÷[8 15
×1 4
],8 15
=
÷8 15
,2 15
=4.