Question

Tính giá trị của biểu thức

a)3 . 10³ + 2 . 10² + 5 . 10

b)35 - 2 . 1¹¹¹ + 3 . 7 . 7²

c)5 . 4³ + 2 . 3 - 81 . 2 + 7

Answer 1

a)3 . 10³ + 2 . 10² + 5 . 10

= 3 . 10² . 10 + 2 . 10 . 10 + 5 . 10

= 10 . ( 3 . 10² + 2 . 10 + 5 )

= 10 . ( 3 . 100 + 20 + 5 )

= 10 . ( 300 + 20 + 5 )

= 10 . 325

= 3250

Answer 2

a) 3 . 10³ + 2 . 10² + 5 . 10

= 3 . 1000 + 2 . 100 + 5 . 10

= 3000 + 200 + 50

= 3250

Answer 3

b)35 - 2 . 1¹¹¹ + 3 . 7 . 7²

= 5 . 7 - 2 . 1 + 3 . 7 . 49

= 7 . ( 5 + 3 . 49 ) - 2

= 7 . ( 5 + 147 ) - 2

= 7 . 152 - 2 

= 1064 - 2

= 1062

Answer 4

b) 35 - 2 . 1¹¹¹ + 3 . 7 . 7²

= 35 - 2 . 1 + 3 . 7 . 49

= 35 - 2 + 1029

= 33 + 1029

= 1062

Answer 5

c)5 . 4³ + 2 . 3 - 81 . 2 + 7

= 5 . 64 + 6 - 162 + 7

= 320 + 6 - 162 + 7

= 326 - 162 + 7

= 164 + 7

= 171

Answer 6

c) 5 . 4³ + 2 . 3 - 81 . 2 + 7

= 5 . 64 + 2 . 3 - 81 . 2 + 7

= 320 + 6 - 162 + 7

= 326 - 169

= 157

Answer 7

Sory câu c mk sai r

Answer 8

Bn lm giống bn Hoàng Sơn nhé