1)1) 3x/8 = 21/43x = 168/43x = 42x = 14
2) 12/7x = 2/3512 = 2x/3512 * 35 = 2x420 = 2xx = 210
3) 8/5 = 4x/158 15 = 4x 5120 = 20xx = 6
4) 16/5x = 4/2516/5 = 4x/2516 * 25 = 20x400 = 20xx = 20
1)1) x / (2 2/7) = 7 / 0,8x / (16/7) = 7 / 0.8x (7/16) = 7 / 0.8x = 7 / 0.8 16 / 7x = 14 / 1.6x = 8.75
2) (6 5/6) / 4.1 = 6.5 / x(41/6) / 4.1 = 6.5 / x41 / (6 4.1) = 6.5 / xx = 6.5 6 * 4.1 / 41x = 4.1
Пропорции:1) 5:12) 0,25:0,053) 0,72:0,12
1)
1) 3x/8 = 21/4
3x = 168/4
3x = 42
x = 14
2) 12/7x = 2/35
12 = 2x/35
12 * 35 = 2x
420 = 2x
x = 210
3) 8/5 = 4x/15
8 15 = 4x 5
120 = 20x
x = 6
4) 16/5x = 4/25
16/5 = 4x/25
16 * 25 = 20x
400 = 20x
x = 20
1)
1) x / (2 2/7) = 7 / 0,8
x / (16/7) = 7 / 0.8
x (7/16) = 7 / 0.8
x = 7 / 0.8 16 / 7
x = 14 / 1.6
x = 8.75
2) (6 5/6) / 4.1 = 6.5 / x
(41/6) / 4.1 = 6.5 / x
41 / (6 4.1) = 6.5 / x
x = 6.5 6 * 4.1 / 41
x = 4.1
Пропорции:
1) 5:1
2) 0,25:0,05
3) 0,72:0,12