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a)5x+(2x-7)-9x-(-3x+8)+20-8x=
5x+2x- 7-9x+3x-8+20-8x=-7x+5
b)-5x+(-2y+4x)-(7x-8y)-x+(2-6y)=
-5x-2y+4x-7x+8y-x+2-6y=-9x+2
c)-9z-(4-3z)-8y-(-7z+8y)+(-2y-7)=
-9z-4+3z-8y-7z-8y-2y-7=-6z-18y-11
zad 2.
a) -3xy³+3xy-(2xy³-xy)=-3xy³+3xy-2xy³+xy=xy³+4xy=-1(2³)-1razy 2=-8-2=-10
b) -(-48a²+10a)-(-4a-a²)=-48a²-10a-4a+a²=-47a²-14a=47+11=58
c) -(12√c-c)+(-8c+13√c)=-12√c+c-8c+13√c=√c-7c=√4-28=2-28=-26