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Stiind ca a+b=27si c+d=48, calculati a+b+c+d si c+d-a-b



Răspuns :

a+b+c+d=27+48=75
c+d-a-b=c+d-(a+b)=48-27=21
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Daca
a+b=27si c+d=48, atunci
a+b+c+d= 27+48=75

c+d-a-b = 48-(a+b)= 48-27=21