przekształć iloczyny na sumy. a)3(a-2) b)-4(x+y) c)-5(-x+1) d)-3a(jedna 3-a) e))(t-2s-1)razy7 f)1druga(2a-4b+1) g)m(2m+3)
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a) 3a-6
b)-4x-4y
c)5x-5
d) -a+3a^{2}
e)7t-14s-7
f)a-2b+0,5
g)2m^{2} + 3m