a²+2ab+b²=(a+b)²
13,9²+2*13,9*6,1+6,1²= (13,9+6,1)²= 20²= 400
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a²+2ab+b²=(a+b)²
13,9²+2*13,9*6,1+6,1²= (13,9+6,1)²= 20²= 400