wyrazenia algebraiczne: MATEMATYKA 2001 klasa 2 zad 12/89 Wykonaj mnozenie. b) (a+b)(7-b+4c) zad 13/89 b) (1-b)(b-4)+3b d)(b-4)(b-3)-b(b+3) f)x(y+2)+(3x+4-y)(y+4) prosze o rozwiazanie.

*-do 2 potegi zad 13 b) (1-b)(b-4)+3b== 1b-4-b*+4b+3b=8b - 4 -b* d)(b-4)(b-3)-b(b+3)==b*-3b-4b+12-b*-3b=-10b+12 f)x(y+2)+(3x+4-y)(y+4)==xy+2x+3xy+12x+4y+16-y*-4y=4xy+14x+16-y*

(a+b)(7-b+4c)=7a-ab+4ac+7b-b²+4bc (1-b)(b-4)+3b=b-4-b²+4b+3b=-b²+8b-4 (b-4)(b-3)-b(b+3)=b²-3b-4b+12-b²-3b=12-10b x(y+2)+(3x+4-y)(y+4)= xy+2x+3xy+12x+4y+16-y²-4y= =4xy+14x-y²+16