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b.[5k+n][k-2n]-k[4k+n]= 5k²-10kn+nk-2n²-4k²-kn=-k²-9kn= -k(k+9n)
c.[4y+3][y-2]-2y[4-2y]=4y²-8y+3y-6 -8y-4y²= -19y-6
d.-[3c-2][c-1]-c[c-2]= -3c²+3c+2c-2-c²+2c= -4c²+7c-2
e.2[3a²-1]-[a+2][a+2]= 6a²-2- a²-2a-2a-4= 5a²-4a-6
f.5x²[x²+1]-[x²-2][x²+3]= 5x⁴+5x² - x⁴-3x²+2x²+6 = 4x⁴+4x²+6
chyba sie nigdzie nie pomylilam..