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(20,23+a)÷2=30,54 va rog repede

Răspuns :

(20,23+a) = 30,54 x2

20,23 +a = 61,08

a = 61,08- 20,23

a =40,85

(20,23+a):2=30,54

20,23+a=30,54*2=61,08

a=61,08-20,23

a=40,85