(1) 3 8 的倒数是 8 3 ,综合算式是: 8 3 - 1 4 × 2 3 = 8 3 - 1 6 = 16 6 - 1 6 = 15 6 = 5 2 ;(2)设这个数是x.由题意可得: 2 3 - 1 4 = 5 6 x 5 6 x= 8 12 - 3 12 5 6 x= 5 12 x= 5 12 × 6 5 x= 1 2 .