Question

1.Tính :

a.\(12+\left\{45-\left[36:\left(12-9\right)^2\right]\right\}\)

b.\(24:\left[48-\left(42:7\right)^2\right]\)

2.Viết tập hợp các số tự nhiên không quá 10 bằng hai cách.

Answer 1

Bài 1:

a.\(12+\left\{45-\left[36:\left(12-9\right)^2\right]\right\}\)

\(=12+\left\{45-\left[36:3^2\right]\right\}\)

\(=12+\left\{45-\left[36:9\right]\right\}\)

\(=12+\left\{45-4\right\}\)

\(=12+41\)

\(=53\)

b.\(24:\left[48-\left(42:7\right)^2\right]\)

\(=24:\left[48-6^2\right]\)

\(=24:\left[48-36\right]\)

\(=24:12=2\)

Bài 2 : 

C1 :  { 0;1;2;3;4;5;6;7;8;9;10}

C2 : \(\left\{x\in N|x\le10\right\}\)

Answer 2

pha ngoac ra la dc

con bai 2 C1 {1:2:3:4:5:6:7:8:9:0}

C2 {nt huoc N /n<10}

Answer 3

a) 12 + {45 - [36 : (12 - 9)² ]}

= 12 + [45 - (36 : 3²)]

= 12 + [45 - (36 : 9)]

= 12 + (45 - 4)

= 12 + 41

= 53

Answer 4

1/ a) 12 + { 45 - [ 36 : 9 ]}

= 12 + { 45 - 4 }

= 12 + 41

= 53

b) 24 : [ 48 - ( 42 : 7 )² ]

= 24 : [ 48 - 36 ]

= 24 : 12

= 2

2/ 

A = { 0;1;2;3;4;5;6;7;8;9;10}

A = { x\(\in\)N / x\(\le\)10 }

Hk tốt