log9 81=?

log9^8×log4^27=____. log9的五次=A log9的七次=B log3的35次? 已知log9 5=a,log9 7=b,求log35 9的值 log9(45)-log9(5) 计算:(log4 3+log8 3)×log9 √2=? log2 根号2+log9 27+4^log4 13=? 求x,y值.6log9^x+3log27^y=8log3^x+2log9^y=2 log9的5次=a,log9的7次=b,求log35的9次, 若tanA、tanB是方程x^2-2(log8 72 + log9 72)x-log8 72·log9 72=0的两个根 计算：（log4 9+log8 3)(log3 2+log9 2)-log1/3 4√81 log9^5=a,log3^7=b,求log35^9=? a=log9 2/3 b=log8 根号3 c=1/4 比较大小