540-498+62•49 = 874 - (27•90-1999) = 1953 + (17432-56•223) : 16=

540-498+62•49=3080

1. 62*49=3038

2. 540-498=42

3. 42+3038=3080

874 - (27•90-1999) = 443

1. 27*90=2430

2. 2430-1999=431

3. 874-431=443

1953 + (17432-56•223) : 16=2262

1. 56*223=12488

2. 17432-12488=4944

3. 4944:16=309

4. 1953+309=2262