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V/b*c =a
b) L=2(a+b+c) /2
L/2= a+b+c /-b
L/2 -b= a+c /-c
L/2-b-c=a
c) V= 1/2a*b*h /b*h
V/b*h=1/2a / razy 2
2 * ( ułamek, a w liczniku: V; w mianowniku: iloczyn bi h) = a
e) P= (2a+3b)/2*h / 2*h
P/2*h= a+3b / -3b
P/2*h -3b = 3a /3
P/2*h-3b /2=a