(1)[1-( 3 10 + 3 5 )]÷ 4 5 =[1- 9 10 ]÷ 4 5 = 1 10 × 5 4 = 1 8 (2)( 11 12 - 3 4 )÷(2- 1 2 )= 1 6 × 2 3 = 1 9 (3)( 3 25 + 7 144 )×25×144= 3 25 ×25×144+ 7 144 ×25×144=3×144+7×25=432+175=607