(1)46.7-15.03-4.97,=46.7-(15.03+4.97),=46.7-20,=26.7;(2)12.8-3.68÷2.3,=12.8-1.6,=11.2;(3)( 11 12 - 3 4 )÷(1+ 1 2 ),= 1 6 ÷ 3 2 ,= 1 9 ;(4)85×0.75+ 3 4 ×15,=(85+15)× 3 4 ,=100× 3 4 ,=75.