(1)求比值. 142/5:0.72 4/7:11/7 31/2:21/3(2)化简比. 71/5:0.24 12.6:0.4 20:1.

问题描述:

(1)求比值.

14
2
5
:0.72
4
7
:1
1
7
3
1
2
:2
1
3
(2)化简比.
7
1
5
:0.24
12.6:0.4 20:1.

(1)1425:0.72,=14.4÷0.72,=20;47:117,=47÷87,=12;312:213,=72÷73,=32.(2)715:0.24,=(7.2×50):(0.24×50),=360:12,=(360÷12):(12÷12),=30:1;12.6:0.4,=(12.6×5...