(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
|
|
3
|
7
|
12.6:0.4 | 20:1. |
答
(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...