a. 2.(72 – 2.32) – 60
= 2.(49 – 2.9) – 60
= 2.31 – 60
= 62 – 60 = 2
b. 27.63 + 27.37
= 27.(63 + 37)
= 27.100
= 2700
c. l-7l + (-8) + l-11l + 2
= 7 + (-8) + 11 + 2
= 12
d. 568 – 34 {5.l9 – ( 4-1)2l + 10}
= 568 – 34 {5.[9-9] + 10}
= 568 – 34.10
= 568 – 340
= 228
2 . ( 72 - 2 . 32) - 60
= 2 . ( 72 - 64 ) - 60
= 2. 8 - 60
= 16 - 60
= - 44
27. 63 + 27 . 37
= 27 . ( 63 + 37)
= 27 . 100
= 2700
|-7| + (-8) + |-11| + 2
= 7 + (-8) + 11 + 2
= -1 + 11 + 2
= 10 + 2
=12
568 - 34 {5.|9-(4-1).2|+10}
= 568 - 34 { 5.|9- 3 . 2|+10}
= 568 -34 {5.|9-6|+10}
= 568 - 34{5.|3|+10}
= 568 - 34{5.3+10}
= 568 - 34(15+10)
= 568 - 34.25
= 568 - 850
= -282