(1)128:34,
=128÷34,
=
;64 17
128:34,
=(128÷2):(34÷2),
=64:17.
(2)0.54:2.7,
=0.54÷2.7,
=
;1 5
0.54:2.7,
=(0.54×50):(2.7×50),
=27:135,
=(27÷27):(135÷27),
=1:5.
(3)0.4米:60厘米,
=40厘米:60厘米,
=40÷60,
=
;2 3
0.4米:60厘米,
=40厘米:60厘米,
=(40÷20):(60÷20),
=2:3.
(4)
:3 8
,5 6
=
÷3 8
,5 6
=
;9 20
:3 8
,5 6
=(
×24):(3 8
×24),5 6
=9:20.
(5)42:
,25 71
=42÷
,25 71
=
;2982 25
42:
,25 71
=(42×71):(
×71),25 71
=2982:25.