(5/2x)³ + 4/64 = 129/64
R:
(5/2x)³ + 4/64 = 129/64 /(4/64)
(5/2x)³ = 125/64
5³/2x³=125/64 /*2x³ /+ /*64 Regel: (Potenzen von Quotienten angewandt.....(a/b)n=an/bn)
125*64=125*2x³ / :125
64=2x³ /:2
32=x³
3√32=x
x=3,17
Probe:
(5/(2*3,17)³ + 4/64 = 129/64
0,0821=2,0156