(1)32× 3 8 ÷ 6 7 =12÷ 6 7 =14;(2) 7 9 × 5 8 + 7 9 × 3 8 = 7 9 ×( 5 8 + 3 8 )= 7 9 ×1= 7 9 ;(3)15÷( 5 12 + 5 6 )=15÷ 5 4 =12;(4) 5 6 × 3 7 × 2 5 = 5 14 × 2 5 = 1 7 .