2 . |−21| − 3 . |125| − 5 . |−33| − |2 . 21|;

Lời giải:

2 . |−21| − 3 . |125| − 5 . |−33| − |2 . 21|

= 2 . 21 − 3 . 125 − 5 . 33 – 42

= 42 – 375 – 165 – 42

= – 333 – 165 – 42

= – 498 – 42 = – 540.