zapisz w najprostszej postaci: a) (a+b)-(2a-b)-(a-2b) b) (3x-y+1)-(x+y)+(y-x) c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)
a) (a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b=-2a+4b
b) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)=-kx-ny-3kx-2ny+5kx-3ny=kx-6ny
a)a+b+(-2a)+b+(-a)+2b=-2a+4b
b)3x-y+1+(-x)-y+y-x=x-y+1
c)-kx-ny+(-3kx)-2ny+5kx-3ny=kx-6ny
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a) (a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b=-2a+4b
b) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)=-kx-ny-3kx-2ny+5kx-3ny=kx-6ny
a)a+b+(-2a)+b+(-a)+2b=-2a+4b
b)3x-y+1+(-x)-y+y-x=x-y+1
c)-kx-ny+(-3kx)-2ny+5kx-3ny=kx-6ny