Uprośc wyrażenie.
a) (5y+1) (1-5y) - (1 + 5y) do potęgi 2
b) (2x-y) (2x +y) + (3x+2y) (3x-2y)
c) (y+3x) (3x-y) -(x-5y) (x+5y)
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a)5y-25y (do p.2)+1-5y-(1+5y)(1+5y)=-25y(do p.2)+1-1+5y+5y+25y(do p.2)=10y
b)4x(do p.2)+2xy-2xy-y(do p.2)+9x(do p.2)-6xy+6xy-4y(do p.2)=13x(do p.2)-5y(do p.2)
c)3xy-y(do p.2)+9x(do p.2)-3xy-x(do p.2)+5xy-5xy-25y(do p.2)=-26y(do p.2)+8x(do p.2)