化简比、求比值. 140/35 0.4:2/3 0.3吨:150千克 0.6:2/3.

问题描述:

化简比、求比值.

140
35

0.4:
2
3

0.3吨:150千克
0.6:
2
3

(1)

140
35
=140:35,
=(140÷35):(35÷35),
=4:1;
140
35
=140÷35=4;
(2)0.4:
2
3

=
2
5
2
3

=(
2
5
×
15
2
):(
2
3
×
15
2
),
=3:5;
0.4:
2
3
=0.4÷
2
3

=0.4×
3
2

=0.6;
(3)0.3吨:150千克,
=300:150,
=(300÷150):(150÷150),
=2:1;
0.3吨:150千克,
=300:150,
=300÷150,
=2;
(4)0.6:
2
3

=
3
5
2
3

=(
3
5
×15):(
2
3
×15),
=9:10;
0.6:
2
3

=0.6÷
2
3

=0.6×
3
2

=0.9.