2x+5y-3=02x+5y=34^x*32^y=2^(2x)*2^(5y)=2^(2x+5y)=2^3=8
由2x+5y-3 = 0，得2x+5y = 34^x × 32^y = 2^2x × 2^5y = 2^(2x+5y) = 2^3 = 8
