(1)(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
(2)7.25×16.3-12.3×7.25,
=(16.3-12.3)×7.25,
=4×7.25,
=4×(7+0.25),
=28+1,
=29;
(3)(
+7 8
)÷3 4
,1 8
=
×8,13 8
=13;
(4)91+91×(
-2 13
),1 7
=91+91×
-91×2 13
,1 7
=91+14-13,
=92;
(5)5.2×101,
=5.2×(100+1),
=520+5.2,
=525.2;
(6)14.6-3.625-6.375,
=14.6-(3.625+6.375),
=14.6-10,
=4.6.