Zapisz w jak najprostszej postaci.
1) 5(x+3+y)(x-1)=
2) -3(2y-3x)+2(-3y+2x)=
3) (12a-7b)(a+b)=
4) -(-y^2+5y-6)+(-2y^2 - y+8)
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1)5x+15+5y+5x-5=
2)-6y+9x-6y+4x=
3)13a-6b=
1) =(5x+15+5y)(x-1)=5x^2-5x+15x-15+5xy-5y=5x^2+10x-15+5xy-5y (nie jestem pewna)
2) =-6y+9x-6y+4x=-12y+13x
3) =12a^2+12ab-7ab-7b^2=12a^2+5ab-7b^2
4) =y^2-5y+6-2y^2-y+8=-y^2-6y+14