a) ay+by+ax+bx
b)3xy-6y+2ax-4a
c)x^2
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a/ \(ab-2b-3a+6=\left(ab-2b\right)-\left(3a-6\right)=b\left(a-2\right)-3\left(a-2\right)=\left(a-2\right)\left(b-3\right)\)
b/ \(ax-by-ay+bx==\left(ax+bx\right)-\left(by+ay\right)=x\left(a+b\right)-y\left(b+a\right)=\left(a+b\right)\left(x-y\right)\)
c/ \(ax+by-ay-bx=\left(ax-ay\right)+\left(by-bx\right)=a\left(x-y\right)+b\left(y-x\right)=a\left(x-y\right)-b\left(x-y\right)=\left(x-y\right)\left(a-b\right)\)
d/ \(a^2-\left(b+c\right)a+bc=a^2-ab-ac+bc=\left(a^2-ac\right)+\left(ab-bc\right)=a\left(a-c\right)+b\left(a-c\right)=\left(a-c\right)\left(a+b\right)\)e/ \(\left(3a-2\right)\left(4a-3\right)-\left(2-3a\right)\left(3a+1\right)=\left(3a-2\right)\left(4a-3\right)+\left(3a-2\right)\left(3a+1\right)=\left(3a-2\right)\left(4a-3+3a+1\right)=\left(3a-2\right)\left(7a-2\right)\)
f/ \(ax+ay+az-bx-by-bz-x-y-z=\left(ax+ay+az\right)-\left(bx+by+bz\right)-\left(x+y+z\right)\)
\(=a\left(x+y+z\right)-b\left(x+y+z\right)-\left(x+y+z\right)=\left(x+y+z\right)\left(a-b-1\right)\)
a) A = ax - ay - bx + by
A = a(x - y) - b(x - y)
A = (a - b)(x - y)
A = 1. (-2) = -2
B = 2ax + 2ay - 2bx - 2by
B = 2a(x + y) - 2b(x + y)
B = 2(x + y)(a - b)
B = 2. (-5).(-2) = 20
A = xy + y - 2x - 2
= y( x + 1 ) - 2( x + 1 )
= ( x + 1 )( y - 2 )
B = x2 - 3x + xy - 3y
= x( x - 3 ) + y( x - 3 )
= ( x - 3 )( x + y )
C = 3x2 - 3xy - 5x + 5y
= 3x( x - y ) - 5( x - y )
= ( x - y )( 3x - 5 )
D = xy + 1 + x + y
= y( x + 1 ) + ( x + 1 )
= ( x + 1 )( y + 1 )
E = ax - bx + ab - x2
= ( ax - x2 ) + ( ab - bx )
= x( a - x ) + b( a - x )
= ( a - x )( x + b )
F = x2 + ab + ax + bx
= ( ax + x2 ) + ( ab + bx )
= x( a + x ) + b( a + x )
= ( a + x )( x + b )
G = a3 - a2x - ay + xy
= a2( a - x ) - y( a - x )
= ( a - x )( a2 - y )
Bonus : = ( a - x )[ a2 - ( √y )2 ]
= ( a - x )( a - √y )( a + √y )
H = 2xy + 3z + 6y + xz
= ( 6y + 2xy ) + ( 3z + xz )
= 2y( 3 + x ) + z( 3 + x )
= ( 3 + x )( 2y + z )
A = xy + y - 2x - 2 = y(x + 1) - 2(x + 1) = (y - 2)(x + !1
B = x2 - 3x + xy - 3y = x(x - 3) + y(x - 3) = (x + y)(x - 3)
C = 3x2 - 3xy - 5x + 5y = 3x(x - y) - 5(x - y) = (3x - 5)(x - y)
D = xy + 1 + x + y = xy + x + y + 1 = x(y + 1) + (y + 1) = (x + 1)(y + 1)
E = ax - bx + ab - x2 = ax - x2 + ab - bx = a(a - x) - b(a - x) = (a - b)(a - x)
F = x2 + ab + ax + bx = ab + ax + bx + x2 = a(b + x) + x(b + x) = (a + x)(b + x)
G = a3 - a2x - ay + xy = a2(a - x) - y(a - x) = (a2 - y)(a - x)
H = 2xy + 3z + 6y + xz = 2xy + 6y + 3z + xz = 2y(x + 3) + z(x + 3) = (2y + z)(x + 3)
ĐK : \(y\ne2x,a\ne-b\)
\(A=\frac{ac+bx+ax+bc}{ay+2bx+2ax+by}\)
\(=\frac{\left(ac+ax\right)+\left(bx+bc\right)}{\left(ay+by\right)+\left(2ax+2bx\right)}\)
\(=\frac{a\left(c+x\right)+b\left(c+x\right)}{y\left(a+b\right)+2x\left(a+b\right)}\)
\(=\frac{\left(c+x\right)\left(a+b\right)}{\left(a+b\right)\left(y+2x\right)}\)
\(=\frac{c+x}{y+2x}\) không phụ thuộc vào \(a,b\) ( đpcm )
a) Ta có : \(\frac{x^2-y^2}{(x+y)(ay-ax)}\) = \(\frac{(x-y)(x+y)}{(x+y).a(y-x)}\)
= \(\frac{(x-y)(x+y)}{-a(x-y)(x+y)}\)
= \(\frac{-1}{a}\)
Vì \(\frac{x^2-y^2}{(x+y)(ay-ax)}\) = \(\frac{-1}{a}\) Nên giá trị của \(\frac{x^2-y^2}{(x+y)(ay-ax)}\) không phụ thuộc vào biến x
a) \(ay+by+ax+bx\)
\(=y\left(a+b\right)+x\left(a+b\right)\)
\(=\left(a+b\right)\left(x+y\right)\)
b) \(3xy-6y+2ax-4a\)
\(=3y\left(x-2\right)+2a\left(x-2\right)\)
\(=\left(x-2\right)\left(3y+2a\right)\)
c) sai đề ?
p/s: Trần Quỳnh Phương tên đẹp đấy nhưng lần sau nhớ viết đề cẩn thân hơn nhé!