若a的x次方=b的y次方=1994的z次方,且有x/1+y/1=z/1,则2a+b的一切可能...答:设a^x = b^y = 1994^z=m 则xlga = ylgb = zlg1994=lgm,∴1/x = lga/lgm,1/y = lgb/lgm,1/z=lg1994/lgm,∵1/x + 1/y = 1/z,∴lg ab = lg1994,∴ab = 1994,∵a、b是不等于1的正整数,∴a×b=1994 = 2×997,∴a=2,b=997,或a=997,b=2.∴2a+b=...