(1)3.4×1.25+1.25×4.6
=(3.4+4.6)×1.25,
=8×1.25,
=10;
(2)1.8÷1.5-0.4×0.7
=1.2-0.28,
=0.92;
(3)25×3.2×12.5
=(25×0.4)×(8×12.5),
=10×100,
=1000;
(4)(
+9 10
)×(3 5
-2 9
)2 15
=
×3 2
,4 45
=
;2 15
(5)35÷[(
-5 6
)×3]2 3
=35÷[
×3),1 6
=35÷
,1 2
=70.