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2014-09-03T11:01:14+03:00
A) a* (b+c)= ab+ac=  -2/5 +1/3=  (-10+5)/15=  -5/15= -1/3

b)a*(b-c)= ab-ac= -2/5-1/3= (-10-5)/15= -15/15=-1
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