Bài 1.53. Trang 27

a)  110– $7^{2}$ + 22 : 2

= 110 – 49 + 11

= 61 + 11

= 72

b) 9.($8^{2}$ –15 )

= 9. ( 64 – 15 )

= 9.49

= 441

c) 5.8 – ( 17 + 8 ) : 5

= 40 – 25 : 5

= 40 – 5

= 35

d)  75 : 3 + 6.$9^{2}$

= 25 + 6.81

= 25 + 486

= 511