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Stiind ca a+15+b=45calculati:
a)(a+b)+11
b)a+(b+17)
c)53-(a+b)

d)


Răspuns :

a+15+b=45
a+b=45-15=30

a)(a+b)+11=30+11=41
b)a+(b+17)=a+b+17=30+17=47
c)53-(a+b)
=53-30=23
a+15+b=45
a+b=45-15
a+b=30
a) Daca ca a+b=30 atunci (a+b)+11=30+11=41
b) Daca a+b=30 atunci a+(b+17)=a+b+17=30+17=47
c) Daca a+b=30 atunci 53-(a+b)=53-30=23