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stiind ca a+7+b=37 calculati: (a+b)+5, a+(b+11) ,47-(a+b)

Răspuns :

a+7+b=37
atunci a+b=30 a=15; b=15;
(a+b)+5: (15+15)+5=35;
a+(b+11): 15+(15+11)=41;
47-(a+b): 47-(15+15)=17

a + b = 37 - 7
a + b = 30

 a + b + 5 = 30 - 5 25

a + b + 11 = 30 -11 = 19

47 - (a + b) = 47 - 30 = 17