(1)4:16,
=(4÷4):(16÷4),
=1:4;
4:16=1:4=1÷4=
.1 4
(2)5.6:4.2,
=(5.6×10÷14):(4.2×10÷14),
=4:3;
5.6:4.2=4:3=4÷3=
.4 3
(3)75:15,
=(75÷15):(15÷15),
=5:1;
75:15=5:1=5÷1=5.
(4)
:3 7
,9 21
=(
×21):(3 7
×21),9 21
=9:9,
=1:1;
:3 7
=1:1=1÷1=1.9 21
(5)12.5%:0.5,
=(0.125×8):(0.5×8),
=1:4;
12.5%:0.5=1:4=1÷4=
.1 4
(6)
:37.5%,3 2
=(
×8):(3 2
×8),3 8
=12:3,
=4:1;
:37.5%=4:1=4÷1=4.3 2