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b÷9÷3×2×5=30
Cls a IIIa


Răspuns :

b : 9 : 3 × 2 × 5 = 30

b = 30 : 5 : 2 × 3 × 9

b = 6 : 2 × 3 × 9

b = 3 × 3 × 9

b = 9 × 9

b = 81