35 баллов. Уравнение.
1) 2 : х - 0,4 = 1 : 0,4
2) 3 : 4 = х - 1 : 3,2
3) 36 : 35 = 1 : 5х : 1 : 12

Огромное спасибо!

1)2/x - 0.4 = 1 / 0.4 = 1 / (4/10) = 1 / 4 * 10 = 10 / 4 = 2.52/x = 2.5 + 0.4 = 2.9x = 2 / 2.9 = 0.689655172 ≈ 0.692)3/4 = x - 1/3.2x = 3/4 + 1/3.2 = 0.75 + 0.3125 = 1.06253)36:35 = 1/(5x)/1/12 = 1 / (5x*1*12) = 1 / (60x)60x = 1 / (36/35) = 35/36x = 35/36 / 60 = 35 / (36*60) = 35 / 2160 = 7 / 432 = 0.0162037037 ≈ 0.016

1) 2 : x -0.4=1:0,42:x-0,4=1:2/52:x-0,4=1·5/22:x-0,4=5/22:x-0,4=2,52:x=2,5+0,42:x=2,9x=2,9·2x=5,82)3:4=x-1:3,23/4=x-1:16/53/4=x-1·5/163/4=x-5/16x-5/16=3/4x=3/4`⁴+5/16`¹x=12/16+5/16x=17/16x=1 1/163) 36:35=1:5x:1:1236/35=1·1/5x:1·1/1236/35=1/5x:1/121/5x:1/12=36/351/5x=36/35·1/121/5x=36/4201/5x=13/140x=13/140:1/5x=13/140·5x=65/140x=13/28