【La 109鐵佐事務get】評論
252=22x 32 x742=2x3x7(A)2x3x52x72 →最大公因數為2x3x7(B)2x32x5x72 →最大公因數為2x32x7(C)22x3x52x7 →最大公因數為22x3x7(D)22x32x5x7 →最大公因數為22x32x7故答案為(A)