Tính phép tính: 65 × (52 – 44) 19 × (82 – 22)

a) 65 × (52 – 44)

= 65 × 8

= 520

19 × (82 – 22)

= 19 × 60

= 1 140

73 × (15 – 2)

= 73 × 13

= 949

b)81 × (92 – 71)

= 81 × 21

= 1 701

34 × (85 – 72)

= 34 × 13

= 442

62 × (91 – 60)

= 62 × 31

= 1 922