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calcileaza ultima cifra 2³¹+3⁴²​

Răspuns :

2¹=2

2²=4

2³=8

2⁴=16

3¹=3

3²=9

3³=27

3⁴=81

3⁵=243

31/4= 7 rest 3 => u(2³¹)=u(2³)=8

42/5= 8 rest 2 =>u(3⁴²)=u(3²)=9

u(2³¹)+u(3⁴²)=u(8+9)=u(17)=7