Question

Aflati numerele : A×B=28-C

Answer 1

7x4=28-0
7x3=28-7
7x2=28-14
7x1=28-21
7x0=28-28=0
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6x4=28-4
6x3=28-10
6x5=28-(-2)
s.a.m.d. sunt foarte multe combinatii. 
Ti-am dat numai cateva exemple.
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Succes in continuare!

Answer 2

A×B=28-C

C apartine{0,1,2,3,4,5,......,n)

A apartine{4,7}

B apartine{4,7}

7×4=28-0=28
7×4=28-1=27
7×4=28-2=26
7×4=28-3=25
7×4=28-4=24
7×4=28-5=24

Si asa mai departe.
Sper ca te-am ajutat