Đáp án: bài 1:
a, m^2 +2mn+ n^2 _ p^2
= ( m^2 + 2mn +n^2 ) + p^2 = (m+n)^2 -p^2= (m+n-p)(m+n +p)
b, 3ab + 9ac-12ad =3a( b+ 3c - 4d)
c,a^3 - 2a^2 + a = a( a^2 - 2a + 1) = a( a-1)^2
d,5x62 - 10xy + 5y^2 = 5( x^2 - 2xy + y^2) = 5( x-y)^2
e, 3ab^3 + 6ab^2 -18ab= 3ab( b^2 + 2b - 6)
f, x^2 y - xy^2 = xy(x-y)
bài 2
a, 3a.(a-b)+ 2b( a-b)= (3a+2b)( a-b)
b,5/7x(y-2004)-3y(y-2004)=( 5/7x-3y)(y-2004)
c, x( a-b)- y(b-a)=x(a-b) + y(a-b) = ( x+y)(a-b)
d,a^2 ( x-1) - b(1-x)= a^2 ( x-1) + b( x-1) =( a^2+b)( x-1)
e,x( x-4)- 3(4-x) = x(x-4) +3(x-4)= (x+3)(X-4)
F, 2X( X-Y)- (Y-X)= 2x( x-y)+ (x-y)=(2x+1)(x-y)
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