计算：lg1/2-lg5/8+lg12.5-log8^9．log3^4=

lg2分之1减lg5分之8加lg12.5减log8的9次方×log27的8次方 log3 5=m ,log8 3=n 求lg5 7log8^9=a log3^5=b 求lg2 lg3 lg5 设log8^3=p,log3^5=q．则lg5? log3(2)*log8(9) (9/4)^(-1/2)+log8 9*log3 32= log8(9)乘以log3(32)-lg4-2lg5+3+27^(2/3) 设log8(3)=p,log3(5)=q,则lg5=?用p,q表示 已知log8^3=a,log3^5=b,用a,b表示lg5 log8 3=a,log3 5=b求lg5用ab表示 设log8&3=p,log3&5=q,则lg5等于 (log2(3)+log8(9))x(log3(4)+log9(8)+log3(2))