Question

1/2(x+y)的2次方+1/2（x+y)的2次方+1/2(z-y)的2次方=

Answer 1

=(x+y)²+1/2(z-x)²
=x²+2xy+y²+z²-yz+y²/2
=x²+2xy+3y²/2+z²-yz

Answer 2

x2-3x/2=7/2
x2-3x/2+9/16=7/2+9/16
(x-3/4)2=65/16
x-3/4=±√65/4
x=(3-√65)/4，x=(3+√65)/4
123
61
2