化简下列各比74:78 0.63.75 841

化简下列各比74:78 0.63.75 84105 35厘米:4.5米.

(1)
7
4
7
8

=(
7
4
×8):(
7
8
×8),
=14:7,
=2:1;

(2)
0.6
3.75

=
0.6×20
3.75×20

=
12
75

=4:25;

(3)
84
105

=
84÷3
105÷3

=
28
35

=4:5;

(4)35厘米:4.5米,
=35厘米:450厘米,
=(35÷5):(450÷5),
=7:90.
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