(1)8.33-2.43-4.57, =8.33-(2.43+4.57), =8.33-7, =1.33; (2)49×102-2×49, =49×(102-2), =49×100, =4900; (3)101×92, =(100+1)×92, =100×92+1×92, =9200+92, =9292; (4)4800÷25÷4, =4800÷(25×4), =4800÷100, =48.