Question

Usun nawiasy i zredukuj wyrazy podobne a)-(x² -2xy)-(xy-2x² +4)+3xy-x² b)-3a-[6a-4b-(5a-5b)] c)-6x-4y-[-(6x-2y-3x+y)-4x+12+10y] d)8a²bc-(4abc²+10abc²)-[-(4c²ab+10ab²c)-8bca²] e) (3 ½x²-7,5y)-5-(1½+5,5x²-3,2)+2x²+9y f)-3,2x+(0,8y+2z)-(1,2y-0,8x)-(2z-2,4x) g)3(a-3b)-4(2b-4x) h)-5(4a-3b)-4(5a-5b) i)-3x(2x-3y)+2x(-3x-5y-1) j)-2x(x-5y-3)+3x(x+5y+2) Z gory dziekuje

Answer 1

a )
-x²+2xy-xy+2x²-4+3xy-x²=
4xy - 4
b)
-3a-[6a-4b-5a+5b]=
-3a-6a+4b+5a-5b=

-4a-1b
c) 
-6x-4y-[-6x+2y+3x -y-4x+12+10y]=
-6x-4y +6x -2y-3x+y+4x-12-10y=
-15y+x-12