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证明:
|a2(a+1)2(a+2)2(a+3)2b2(b+1)2(b+2)2(b+3)2c2(c+1)2(c+2)2(c+3)2d2(d+1)2(d+2)2(d+3)2|=0;
                        
不再提醒