Question

Bài 4;

a,12.53+53.172-53.84

b,53.35.13+35.17+65.75-65.45

c,2³.15-[115-(12-5)^2]

d,3².22-3².19

Answer 1

Bài 4:

a) 12. 53 + 53. 172 - 53. 84

= 53.(12 + 172 - 84)

= 53. 100

= 5300

b) 53. 35. 13 + 35. 17 + 65. 75 - 65. 45

= 35.(53. 13 + 17) + 65.(75 - 45)

= 35.(689 + 17)+ 65. 30

= 35. 706 + 1950

= 24710 + 1950

= 26660

c) 2³. 15 - [115 - (12 - 5)²]

= 8. 15 - (115 - 7²)

= 120 - (115 - 49)

= 120 - 66

= 54

d) 3². 22 - 3². 19

= 3².(22 - 19)

= 9. 3

= 27

Answer 2

a) 12 . 53 + 53 . 172 + 53 . 84

= 53 . (12 + 172 - 84)

= 53 . 100

= 5300

b) 53 . 35 . 13 + 35 . 17 + 65 . 75 - 65 . 45

= 35 . (53 . 13 + 17) + 65 . (75 - 45)

= 35 . 706 + 65 . 30

= 24710 + 950

= 26660

c) 2³ . 15 - [ 115 - (12 - 5)² ]

= 8 . 15 - (115 - 7²)

= 120 - 115 + 49

= 5 + 49

= 54

d) 3² . 22 - 3² . 19

= 3² . (22 - 19)

= 3² . 3

= 3³

= 27