Найдите неизвестный член пропорции. 1) x:8=15:30 1) x:6=20:40 2) x/7=5/2 2) x/9=7/2 3) 25:10=x:4 3) 35:10=x:6 4) 64:2=128:x 4) 75:15=x:2 5) 18/x=3/24 5) 16/x=7/14

Найдем неизвестный член пропорции:

1) x/8 = 15/30;

x/8 = 1/2;

2 * x = 8;

x = 4;

1) x/6 = 20/40;

x/6 = 1/2;

x = 3;

2) x/7 = 5/2;

2 * x = 35;

x = 35/2;

x = 17.5;

2) x/9 = 7/2;

2 * x = 63;

x = 63/2;

x = 31.5;

3) 25/10 = x/4;

x/4 = 2.5;

x = 2.5 * 4;

x = 10;

3) 35/10 = x/6;

x/6 = 3.5;

x = 3.5 * 6;

x = 21;

4) 64/2 = 128/x;

32 = 128/x;

32 * x = 128;

x = 128/32;

x = 4;

4) 75/15 = x/2;

x/2 = 5;

x = 2 * 5;

x = 10;

5) 18/x = 3/24;

18/x = 1/8;

x = 18 * 8;

x = 144;

5) 16/x = 7/14;

16/x = 1/2;

x = 2 * 16;

x = 32.