Lg(y)=3lg(a) +2lg(b)-3lg(c)= lg(a)³ +lg(b)²-lg(c)³=lg(a³*b²/c³)
a³*b²
y= -----------
c³
lg(y)=1/2lg(a-b) +3lg(b)-2lg(c)= lg√(a-b) +lg(b)³-lg(c)²=lg(√(a-b)*b³/c²)
b³*√(a-b)
y= -----------------
c²
lg(y)=-1/2lg(a) +7lg(b)-2lg(c)-3lg(d)=lg1/√(a) +lg(b)⁷- lg(c)²- lg(d)³ =
= lg b⁷/√(a)*c²*d² = lg b⁷/√(a)*(cd)²
b⁷
y = ------------------
√(a)*(cd)²