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\(2x^2+y^2-3xy+3x-2y+1=0\)
\(2,25x^2-2.1,5.x\left(y-1\right)+\left(y-1\right)^2-0,25x^2=0\)
\(\left(1,5x-y+1\right)^2-\left(0,5x\right)^2=0\)
\(\left(1,5x-y+1-0,5x\right)\left(1,5x-y+1+0,5x\right)=0\)
\(\left(x-y+1\right)\left(2x-y+1\right)=0\)
Đề bài là j thì b tự lm nhé~
Bài làm:
1) Ta có: \(2x^2+5xy+2y^2\)
\(=\left(2x^2+4xy\right)+\left(xy+2y^2\right)\)
\(=2x\left(x+2y\right)+y\left(x+2y\right)\)
\(=\left(2x+y\right)\left(x+2y\right)\)
2) Ta có: \(2x^2+2xy-4y^2\)
\(=\left(2x^2-2xy\right)+\left(4xy-4y^2\right)\)
\(=2x\left(x-y\right)+4y\left(x-y\right)\)
\(=2\left(x+2y\right)\left(x-y\right)\)
\(1)2x^2+5xy+2y^2=2x^2+4xy+xy+2y^2=\left(2x^2+4xy\right)+\left(xy+2y^2\right)=2x\left(x+2y\right)+y\left(x+2y\right)=\left(2x+y\right)\left(x+2y\right)\)\(2)2x^2+2xy-4y^2=2x^2+4xy-2xy-4y^2=\left(2x^2-2xy\right)+\left(4xy-4y^2\right)=2x\left(x-y\right)+4y\left(x-y\right)=\left(2x+4y\right)\left(x-y\right)\)
A = x^2 + y^2 + 2xy - 2x -2y +1
= (x+y)^2 -2.(x+y) + 1
=(x+y -1 )^2
\(x^4+y^2-2x^2y+x^2+2x-2y\)
\(=\left(y^2-x^2y-xy\right)-\left(x^2y-x^4-x^3\right)+\left(xy-x^3-x^2\right)-\left(2y-2x^2-2x\right)\)
\(=y\left(y-x^2-x\right)-x^2\left(y-x^2-x\right)+x\left(y-x^2-x\right)-2\left(y-x^2-x\right)\)
\(=\left(y-x^2+x-2\right)\left(y-x^2-x\right)\)
\(x^2+y^2-x^2y^2+xy-x-y\)
\(\Leftrightarrow x^2\left(1-y\right)\left(1+y\right)-y\left(1-y\right)-x\left(1-y\right)\)
\(\Leftrightarrow\left(1-y\right)\left(x^2+x^2y-y-x\right)\)
\(\Leftrightarrow\left(1-y\right)\left(x+y\right)\left(x-1\right)\left(x+1\right)\)
A = (x^2 + 2xy + y^2) + 2.(x+y) + 1
=(x+y)^2 + 2.(x+y).1 + 1
=(x+y+1)^2
\(1-2y-y^2=1-\left(2y+y^2\right)=1-y\left(2+y\right)\)