1.√(3x-y)+y²-6y+9=0√(3x-y)+(y-3)²=0由于：√(3x-y)≥0；(y-3)²≥0所以：y-3=0 y=3；3x-y=0 3x=y 3x=3 x=1结果：x=1；y=32.1/a+1/b=5/(a+b)(a+b)/(ab)=5/(a+b)(a+b)²=5aba²+2ab+b²=5aba²+b²=3ab(a²+b²)/ab=3ab/(ab)a/b+b/a=3；即：b/a+a/b=33.√(154×64+45²)=√(9856+2025)=√11881=1094.依题意得：1-x^2=(1-x^2)^3 (1-x^2)^2=1 1-x^2=1 x=0；1-x^2=-1 x^2=2 x=√2，或x=-√26.m^2-3m+1=0 m^2=3m-1m^2+19/(m^2+2)=3m-1+19/(3m+1)=(9m^2-1+19)/(3m+1)=[9(3m-1)+18]/(3m+1)=9(3m+1)/(3m+1)=9
12346代表什么意思?
