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x=28cm
f=14cm
Szukane?
y=?
Wzor
1/f=1/x+1/y
Teraz przekształcić wzór trzeba;
1/f=1/x+1/y /* xfy
xfy/f= xyf/x+xfy/y
xy=yf+xf
xy-yf=xf
y(x-f)=xf
y=xf/x-f
y=28*7/ 28-7
y=196/21=9 i 7/21