Question

Wykonaj działania:

a) (m+n)(m-2)+(m-n)(m+1)

b) (3x-2)(3x-2y+10-4x(2x-3y+1)

c) 3(m+1)(n-2)+2(n+1)(m-2)

d) x(x+1)(x+2)-x(x-1)(x-2)

Answer 1

a)

(m+n)(m-2)+(m-n)(m+1)=m²-2m+mn-2n+m²+m-mn-n=2m²-m-3n

b)

ma być tak z tymi nawiasami :

 

(3x-2)(3x-2y)+10-4x(2x-3y+1)=9x²-6xy-6x+4y+10-8x²+12xy-4x=

=x²-6xy+2x+4y+10

c)

3(m+1)(n-2)+2(n+1)(m-2)=3*(mn-2m+n-2)+2*(mn-2n+m-2)=

=3mn-6m+3n-6+2mn-4n+2m-4=5mn-4m-n-10

d)

x(x+1)(x+2)-x(x-1)(x-2)=x(x²+2x+x+2)-x(²x-2x-x+2)=

=x³+2x²+x²+2x-x³+2x²+x²-2x=6x²