x^2 - 2xy + y^2 - z^2 phan tich da thuc thanh nhan tur
phan tich da thuc thanh nhan tu
x^2-x-y^2-y
x^2-2xy+y^2-z^2
bai 32 va 33 sbt
lop 8 bai phan tich da thuc thanh nhan tu bang cach nhom hang tu
Ta có
a, x2-x-y2-y
=x2-y2-(x+y)
=(x-y)(x+y) - (x+y)
=(x+y)(x-y-1)
b, x2-2xy+y2-z2
=(x-y)2-z2
=(x-y-z)(x-y+z)
con bai 32, 33 neu ban tra loi duoc minh h them
phan tich da thuc thanh nhan tu
9-x^2+2xy-y^2
\(=3^2-\left(x-y\right)^2=\left[3-\left(x-y\right)\right]\left[3+\left(x-y\right)\right]=\left(3-x+y\right)\left(3+x-y\right)\)
\(9-x^2+2xy-y^2\)
\(=9-\left(x^2-2xy+y^2\right)\)
\(=3^2-\left(x-y\right)^2\)
\(=\left(3-x+y\right)\left(3-x-y\right)\)
phan tich thanh cac nhan tu da thuc
x^2-25+y+2xy
Phan tich da thuc thanh nhan tu
x2-2xy+y2-3x+3y
=(x^2-2xy-y^2)-(3x-3y)
=(x-y)^2-3(x-y)
=(x-y)(x-y-3)
Phan tich da thuc thanh nhan tu x2_2xy+y2-9z2
x^2-2xy+y^2-9z^2
=(x-y)^2-9z^2
=(x-y)^2-(3z)^2
=(x-y-3z)(x-y+3z)
phan tich da thuc thanh nhan tu
x^2+y^2+z^2+3xyz
Phan tich da thuc thanh nhan tu
x^2 + y^2 + z^2 - 3xyz
phan tich da thuc thanh nhan tu
x^2+y^2+z^2+3xyz
phan tich da thuc thanh nhan tu
a) 7xy^2+5x^2y
b) x^2+2xy+y^2-11x-11y
a) 7xy^2+5x^2y
= xy(7y+5x)
b) x^2+2xy+y^2-11x-11y
= (x^2+2xy+y^2)-(11x+11y)
=(x+y)^2-11(x+y)
=(x+y)(x+y-11)
a) 7xy2 + 5x2y
= xy ( 7y + 5x )
b) x2 + 2xy + y2 - 11x - 11y
= ( x2 + 2xy + y2 ) - ( 11x + 11y )
= ( x + y )2 - 11 ( x + y )
= ( x + y )( x + y - 11 )