①3x(x-1)=x(x+5)
x(3x-3)-x(x+5)=0
x(2x-8)=0所以x1=0x2=4
②2x-3=5x
3x=-3 x=-1
③x²-2x+6=0
x²-2x+1+5=0
(x-1)²+5=0 无解
④（5x-1）²-2=0
（5x-1）²=2 5x-1=±√2 x1=(√2+1)/5x2=(1-√2)/5
⑤3y²-4y=0
y(3y-4)=0 y1=0y2=4/3