Bài 4: 

\(x=130^0\)

`@` `\text {Ans}`

`\downarrow`

`4,`

Vì `\text {MN // BC}`

`=>` $\widehat {B} = \widehat {BMN} = 114^0 (\text {2 góc đối đỉnh})$

Ta có: \(\left\{{}\begin{matrix}\widehat{\text{BMN}}+\widehat{\text{AMN}}=180^0\left(\text{2 góc kề bù}\right)\\\widehat{\text{CNM}}+\widehat{\text{ANM}}=180^0\left(\text{2 góc kề bù}\right)\end{matrix}\right.\)

`=>`\(\left\{{}\begin{matrix}\widehat{\text{AMN}}=180^0-114^0=66^0\\\widehat{\text{ANM}}=180^0-130^0=50^0\end{matrix}\right.\)

Xét `\Delta AMN`:

\(\widehat{\text{A}}+\widehat{\text{M}}+\widehat{\text{N}}=180^0\left(\text{định lý tổng 3 góc trong 1 tgiac}\right)\)

`=>`\(\widehat{\text{A}}+66^0+50^0=180^0\)

`=>`\(\widehat{\text{A}}=180^0-66^0-50^0=64^0\)

Mà \(\widehat{\text{A}}=\widehat{\text{x}}\)

`=>`\(\widehat{\text{x}}=64^0\)

Vậy, số đo của góc `x = 64^0.`

1 are

2 am

3 is

4 are

5 are

6 are

7 is

8 is

9 is

10 are

IV

1 is writing

2 are losing

3 is having

4 is staying

5 am not lying

6 is always using

7 are having

8 Are you playing

9 are not touching

10 Is - listening

11 Is- winning

12 am not staying

13 is not working

14 is not reading

15 isn't raining

16 am not listening

17 Are they making

18 Are you doing

19 Is - sitting

20 is - doing

21 are-putting

22 are-wearing

23 is-studying

2, am

3, is

4,are

5,are

6,are

7,is

8,is

9,is

10,are

IV

1,2,7 OK

3,is having

4,has stayed

5,am not lying

6,always uses

8,Are-playing

9,not to touch

10,Is-listening

11,Are-winning

12,am not staying

13,isn't working

14,isn't reading

15,isn't raining

16,am not listening

17,Are-making

18,Are-doing

19,Is-sitting

20,is-doing

21,do-putting

22,do-wear

23,is-studying

My grandma often works in the garden in her free time.

What are you doing with the stove?

3. My grandma often works in the garden in her free time.

4. What are you doing with the stove?

3. My grandma often works in the garden in her free time.

4. What are you doing with the stove?

gõ câu hỏi ra đi bạn 

1. a) 6² : 4 . 3 + 2 . 5²

= 36 : 4 . 3 + 2 . 25

= 9 . 3 + 50

= 27 + 50

= 77

b) 5 . 4² - 32 : 4²

= 5 . 16 - 32 : 16

= 80 - 2

= 78

c) 80 - (4 . 5² - 3 .2³)

= 80 - (4 . 25 - 3 . 8)

= 80 - (100 - 24)

= 80 - 76

= 4

d) 2448 : [119 - (23 - 6)]

= 2448 : (119 - 17)

= 2448 : 102

= 24

e) 23 . 85 + 15 . 23 + 170

= 23 . (85 + 15) + 170

= 23 . 100 + 170

= 2300 + 170

= 2470

f) 3³ . 2  - 5 . 2023⁰ + 36 : 3²

= 27 . 2 - 5 . 1 + 36 : 9

= 54 - 5 + 4

= 53

2. a) 123 - 5.(x + 4) = 38

5.(x + 4) = 123 - 38

5.(x + 4) = 85

x + 4 = 85 : 5

x + 4 = 17

x = 17 - 4

x = 13

b) (3.x - 2⁴) . 7³ = 2 . 7⁴

3x - 16 = 2 . 7⁴ : 7³

3x - 16 = 2 . 7

3x = 14 + 16

3x = 30

x = 30 : 3

x = 10

c) (2600 + 6400) - 3.x = 1200

9000 - 3x = 1200

3x = 9000 - 1200

3x = 7800

x = 7800 : 3

x = 2600

d) [(6.x - 72) : 2 - 84] . 28 = 5628

(6x - 72) : 2 - 84 = 5628 : 28

(6x - 72) : 2 - 84 = 201

(6x - 72) : 2 = 201 + 84

(6x - 72) : 2 = 285

6x - 72 = 285 . 2

6x - 72 = 570

6x = 570 + 72

6x = 642

x = 642 : 6

x = 107

e) 70 - 5(x - 3) = 45

5(x - 3) = 70 - 45

5(x - 3) = 25

x - 3 = 25 : 5

x - 3 = 5

x = 5 + 3

x = 8

f) 10 + 2.x = 4⁷ : 4⁵

10 + 2x = 4²

10 + 2x = 16

2x = 16 - 10

2x = 6

x = 6 : 2

x = 3

g) 2.x - 138 = 2³.2²

2x - 138 = 2⁵

2x - 138 = 32

2x = 32 + 138

2x = 170

x = 170 : 2

x = 85

h) 231 - (x - 6) = 1339 : 13

231 - (x - 6) = 103

x - 6 = 231 - 103

x - 6 = 128

x = 128 + 6

x = 134

1.Tính:

a) \(6^2:4.3+2.5^2\)

\(=36:4.3+2.25\)

\(=9.3+50\)

\(=27+50\)

\(=77\)

b) \(5.4^2-32:4^2\)

\(=5.16-32:16\)

\(=80-2\)

\(=78\)

c) \(80-\left(4.5^2-3.2^3\right)\)

\(=80-\left(4.25-3.8\right)\)

\(=80-\left(100-24\right)\)

\(=80-76\)

\(=4\)

d) \(2448:\left[119-\left(23-6\right)\right]\)

\(=2448:\left[119-17\right]\)

\(=2448:102\)

\(=24\)

e) \(23.85+15.23+170\)

\(=23\left(85+15\right)+170\)

\(=23.100+170\)

\(=2300+170\)

\(=2470\)

f) \(3^3.2-5.2023^0+36:3^2\)

\(=27.2-5.1+36:9\)

\(=54-5+4\)

\(=53\)

2. Tìm x biết:

a) \(123-5.\left(x+4\right)=38\)

\(=>5.\left(x+4\right)=123-38\)

\(=>5.\left(x+4\right)=85\)

\(=>x+4=85:5\)

\(=>x+4=17\)

\(=>x=17-4\)

\(=>x=13\)

b) \(\left(3.x-2^4\right).7^3=2.7^4\)

\(=>3.x-2^4=2.7^4:7^3\)

\(=>3.x-2^4=2.7\)

\(=>3.x-16=14\)

\(=>3.x=14+16\)

\(=>3.x=30\)

\(=>x=30:3\)

\(=>x=10\)

c) \(\left(2600+6400\right)-3.x=1200\)

\(=>9000-3.x=1200\)

\(=>3.x=9000-1200\)

\(=>3.x=7800\)

\(=>x=7800:3\)

\(=>x=2600\)

d) \(\left[\left(6.x-72\right):2-84\right].28=5628\)

\(=>\left(6.x-72\right):2-84=5628:28\)

\(=>\left(6.x-72\right):2-84=201\)

\(=>\left(6.x-72\right):2=201+84\)

\(=>\left(6.x-72\right):2=285\)

\(=>6.x-72=285\times2\)

\(=>6.x-72=570\)

\(=>6.x=570+72\)

\(=>6.x=642\)

\(=>x=642:6\)

\(=>x=107\)

e) \(70-5.\left(x-3\right)=45\)

\(=>5.\left(x-3\right)=70-45\)

\(=>5.\left(x-3\right)=25\)

\(=>x-3=25:5\)

\(=>x-3=5\)

\(=>x=5+3\)

\(=>x=8\)

f) \(10+2.x=4^7:4^5\)

\(=>10+2.x=4^2\)

\(=>10+2.x=16\)

\(=>2.x=16-10\)

\(=>2.x=6\)

\(=>x=6:2\)

\(=>x=3\)

g) \(2.x-138=2^3.3^2\)

\(=>2.x-138=8.9\)

\(=>2.x-138=72\)

\(=>2.x=72+138\)

\(=>2.x=210\)

\(=>x=210:2\)

\(=>x=105\)

h) \(231-\left(x-6\right)=1339:13\)

\(=>231-\left(x-6\right)=103\)

\(=>x-6=231-103\)

\(=>x-6=128\)

\(=>x=128+6\)

\(=>x=134\)

Chúc bạn học tốt

Câu 3: 

a: Ta có: \(2x\left(3x-1\right)-\left(x-3\right)\left(6x+2\right)\)

\(=6x^2-2x-6x^2-2x+18x+6\)

=14x+6

b: Ta có: \(2x\left(x+7\right)-3x\left(x+1\right)\)

\(=2x^2+14x-3x^2-3x\)

\(=-x^2+11x\)

Câu 2: 

a: Ta có: \(\left(-8x^5+12x^3-16x^2\right):4x^2\)

\(=-8x^5:4x^2+12x^3:4x^2-16x^2:4x^2\)

\(=-2x^3+3x-4\)

b: Ta có: \(\left(12x^3y^3-18x^2y+9xy^2\right):6xy\)

\(=12x^3y^3:6xy-18x^2y:6xy+9xy^2:6xy\)

\(=2x^2y^2-3x+\dfrac{3}{2}y\)

c: Ta có: \(\dfrac{x^3-11x^2+27x-9}{x-3}\)

\(=\dfrac{x^3-3x^2-8x^2+24x+3x-9}{x-3}\)

\(=x^2-8x+3\)

d: Ta có: \(\dfrac{6x^4-13x^3+7x^2-x-5}{3x+1}\)

\(=\dfrac{6x^4+2x^3-15x^3-5x^2+12x^2+4x-5x-\dfrac{5}{3}-\dfrac{10}{3}}{3x+1}\)

\(=2x^3-5x^2+4x-\dfrac{5}{3}-\dfrac{\dfrac{10}{3}}{3x+1}\)

\(D=10\cdot\left(-2.5\right)\cdot0.4\cdot\left(-0.1\right)\)

\(=10\cdot1\cdot2.5\cdot0.4\)

=10

???