(1)( 5 6 + 3 8 )×48= 5 6 ×48+ 3 8 ×48=40+18=58;(2)33÷ 11 15 -33=33×( 15 11 -1)=33× 4 11 =12;(3)36×75%+64× 3 4 =(36+64)×75%=100×75%=75.