1.Wykonaj mnożenie .
a) (x+2)(y+1)
b) (2a+1)(3-b)
c) (a-1)(a do potegi 2 -b do potegi 2 )
d) (2x-1)(y-3)
e) (x-y)(a-b+9)
f) (k do potegi 2 -2k+2)(t+8)
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a)xy+x+2y+2
b)6a-2ab+3-b
c)a^3-ab^2-a^2+b^2
d) 2xy-6x-y+3
e)xa-xb+9x-ay+by-9y
f)tk^2+8k^2-2tk-16k+2t+16