x²-4x+y²-10y+29=0x²-4x+4+y²-10y+25=0(x-2)²+(y-5)²=0x-2=0  y-5=0x=2    y=5于是x²+2x³y²+x⁴y²=x²(1+2xy²+x²y²)=2&...