vp thu chut zay
~~~~~~~~~~~~~~~~
A= 1^2 +3^2 +(7-5)(7+5) +(11-9)(11+9) +(15-13)(15+13) +(19-17)(19+17)
A= 10 +2.(12 +20 + 28 +36)
A= 10 + 2.(96)
A= 10 +192 = 202
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vp thu chut zay
~~~~~~~~~~~~~~~~
A= 1^2 +3^2 +(7-5)(7+5) +(11-9)(11+9) +(15-13)(15+13) +(19-17)(19+17)
A= 10 +2.(12 +20 + 28 +36)
A= 10 + 2.(96)
A= 10 +192 = 202