Simplify first, and then evaluate x 5y x 5y x 5y squared, where x 0 5, y 1

The square of the original ( 5y) x the square of 5y x=25y square-x square-5y+x

If you want to merge, you can write it as 5y(5y-1)+x(1-x).

Bring it in.

x-5y)(-x-5y)-(x+5y) 2-(x 2 -25y 2) -(x 2 -10xy+25y 2) this answer.

x 2 +25y 2 -x 2 +10xy-25y2 (forest socks -1-1) x 2 +(25-25)y 2 +10xy-2x 2 +10xy, x=-1, y=, above = -2 (-1) 2 +10 (-1).

x-5y）（-x-5y）-（x+5y）2

x225y2

Lift which-(x2

10xy+25y2

This answer is exciting. -x2

25y2x2

10xy-25y2

Mori socks -1-1) x2

25-25）y2

10xy-2x2

10xy,x=-1,y=,above equation=-2 (-1)2

x+5y)(x+4y)晌备布-(x-y)feast (x+y),x29xy+20y2x2y2

9xy+21y2

Rolling socks. When x=2, y=-1, the original formula = 9xy + 21y2

x+5y)(x+4y)-(x-y)(x+y),x 2 +9xy+20y 2 -x 2 +y 2

9xy+21y 2 ．

When x=2,y=-1, the original Nawang = 9xy+21y 2 =-18+21=3

5x-3y-2xy)-(6x+5y-2xy)=5x-3y-2xy-6x-5y+2xy=-x-8y, when x=-5, y=-1, the original buried scattered digging hunger = -(5) bending -8 (-1) = 13

[(5x+4y) 2-4y(5x+4y)] (-5x)= (5x+4y) [5x+4y)-4y] (-5x) (molecular factor).

5x+4y)(5x) / (-5x)= -5x-4y

Substituting, primitive = 5-12 = -7

Solution: Original formula = (5x+4y)(5x+4y-4y) (-5x)=-(5x+4y).

Substitute x=-1 and y=3 into it.

Get -(5+4*3)=-7