(1) 7 9 - 4 7 × 3 4 ,= 7 9 - 3 7 ,= 22 63 ;(2)1.2÷( 1 4 - 1 5 ),=1.2÷ 1 20 ,=1.2×20,=24;(3)0.96÷[(3.5+12.5)×0.3],=0.96÷[16×0.3],=0.96÷4.8,=0.2.