已知12^x=3,12^y=2 求8^(1-2x)

已知12^x=3,12^y=2 求8^(1-2x)/(1-x+y)会解题的帮帮忙!

5个回答

x=1/4,y=1/6;
8*(1-2x)/(1-x+y)
=8*[1-2*(1/4)]/[1-(1/2)+(1/6)]
=8*(1/2)/(2/3)
=8/3