Hallo Littlemix,
3a)
b/a =1.SS d/c → b = a * d / c = ... = 10, \(\overline{60}\) [ = 350/33 ]
y/x =2.SS b/a → y = x * b / a = ... = 7,\(\overline{87}\) [ = 260/33 ]
3b)
a/b =2.SS x/y → a = b * x / y = ... ≈ 4,394 [ genau 413/94 ]
c/d =1.SS a/b → c = d * a / b = ... ≈ 5.1468 [ genau 2419/470 ]
4)
x / 8,9 =2.SS 13,2 / 9,6 → x = 8,9 * 13,2 / 9,6 ≈ 12,359875
Gruß Wolfgang