Question: please solve (5) Show: (a) Let R be a commutative ring, A . R. and A an adco of A in R. Then there is

please solve

(5) Show: (a) Let R be a commutative ring, A . R. and A an adco of A in R. Then there is a B - A with A OB = R. (b) If R is an integral domain and A RR has an adco in R then A is small in R

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