(1)13.2-3.7-6.3,
=13.2-(3.7+6.3),
=13.2-10,
=3.2;
(2)10.26-(3.78+4.26),
=10.26-3.78-4.26,
=(10.26-4.26)-3.78,
=6-3.78,
=2.22;
(3)(
+7 12
)×24,3 8
=
×24+7 12
×24,3 8
=14+9,
=23;
(4)101×7.8,
=(100+1)×7.8,
=100×7.8+1×7.8,
=780+7.8,
=787.8;
(5)
×24+176×20%,1 5
=0.2×24+176×0.2,
=0.2×(24+176),
=0.2×200,
=40;
(6)32×12.5×O.25,
=4×8×12.5×O.25,
=(4×O.25)×(8×12.5),
=1×100,
=100;
(7)8.6×
+8.6÷3,2 3
=8.6×
+8.6×2 3
,1 3
=8.6×(
+2 3
),1 3
=8.6×1,
=8.6;
(8)700÷12.5÷8,
=700÷(12.5×8),
=700÷100,
=7.