Odpowiedź:
c)=(3m+3)(n-2)+(2n+2)(m-2)=3mn-6m+3n-6+2mn-4n+2m-4=5mn-4m-n-10
d)=(x²+x)(x+2)-(x²-x)(x-2)=x³+2x²+x²+2x-(x³-2x²-x²+2x)=x³+3x²+2x-x³+3x²-2x=
6x²
Szczegółowe wyjaśnienie:
a) (m+n) (m-2) + (m-n) (m+1)= m²-2m +nm -2n+m²+m-nm -n= 2m²-m-3n
b) ( 3x-2) ( 3x-2y +1) - 4x (2x -3y +1)= 9x²-6xy +3x -6x +4y -2 -8x²+12xy-4x=x²+6xy -7x+4y-2
c) 3 ( m+1) ( n-2) + 2 ( n+1) (m-2)=(3m+3 )( n-2) + (2n +2) ( 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+2+x+2)-x(x²-2x-x+2)=
=x(x²+3x+2)-x(x²-3x+2)=x³+3x²+2x-x³+3x²-2x=6x²
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Odpowiedź:
c)=(3m+3)(n-2)+(2n+2)(m-2)=3mn-6m+3n-6+2mn-4n+2m-4=5mn-4m-n-10
d)=(x²+x)(x+2)-(x²-x)(x-2)=x³+2x²+x²+2x-(x³-2x²-x²+2x)=x³+3x²+2x-x³+3x²-2x=
6x²
Szczegółowe wyjaśnienie:
Odpowiedź:
a) (m+n) (m-2) + (m-n) (m+1)= m²-2m +nm -2n+m²+m-nm -n= 2m²-m-3n
b) ( 3x-2) ( 3x-2y +1) - 4x (2x -3y +1)= 9x²-6xy +3x -6x +4y -2 -8x²+12xy-4x=x²+6xy -7x+4y-2
c) 3 ( m+1) ( n-2) + 2 ( n+1) (m-2)=(3m+3 )( n-2) + (2n +2) ( 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+2+x+2)-x(x²-2x-x+2)=
=x(x²+3x+2)-x(x²-3x+2)=x³+3x²+2x-x³+3x²-2x=6x²
Szczegółowe wyjaśnienie: