√(x-3) +(3y+4)^2=0x=3 3y+4=0 y=-4/3(x+y)^2014=(3-4/3)^2014=(5/3)^2014=alg a=2014lg(5/3)=2014(0.69897-0.47712)=446.8034a=6.3589*10^446即(x+y)^2014=(3-4/3)^2014=6.3589*10^446