Question

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tim so co 2 chu so biet rang neu lay tong cac chu so cong voi tich cac chu so cua so do thi bang chinh no.

Answer 1

[Thiên Ân]

Theo bài ta có 

( a + b ) . ab = ab

=> a + b = 1 

=> ab = 10 

Answer 2

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giup minh voi