Ta thấy Om là tia phân giác => xOm = 90 : 2 = 45 độ

=> xOn = 45 + 80 = 125 độ

Hội con 🐄 chúc bạn học tốt!!!

\(x,y-x,y.3=1,3\)

\(1.x,y-3.x,y=1,3\)

\(x,y.\left(1+3\right)=1,3\)

\(x,y.4=1,3\)

\(x,y=0,325\)

=> x=0, y = 325

Hội con 🐄 chúc bạn học tốt!!!

ko ghi lại đề

ta có 2 TH

TH1:                                                                                              TH2

\(7x-15=0\)                                                                        \(x1-\frac{1}{9}=0\)

\(7x=15\)                                                                               \(x1=\frac{1}{9}\)

\(x=\frac{15}{7}\)                                                                                \(x=\frac{1}{9}\)

Vậy \(x\in\left\{\frac{15}{7};\frac{1}{9}\right\}\)

(7x-15).(x1-1\9)=0

<=>(7x-15).(x-1/9)=0

\(\orbr{\begin{cases}7x-15=0\\x-\frac{1}{9}=0\end{cases}\Leftrightarrow\orbr{\begin{cases}7x=15\\x=\frac{1}{9}\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=\frac{15}{7}\\x=\frac{1}{9}\end{cases}}\)

\(\text{vậy }x\in\left\{\frac{15}{7};\frac{1}{9}\right\}\)

c)136.68+16.272

=136.68+16.2.136

=136.68+32.136

=136.(68+32)

=136.100=13600

a)19.64+76.34

=19.64+19.4.34

=19.64+19.136

=19.(64+136)

=19.200=3800

b)=(35+65)6.2.13

 =100.(2.13).6

 =100.(26.6)

 =100.153

 =15300

\(3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot\left(7^8-7^6+7^0\right)\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot5647153\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-45177224\right]\right\}\)

\(=3^3\cdot5^3-20\cdot\left\{300--45176678\right\}\)

\(=3^3\cdot5^3-20\cdot45176978\)

\(=3375-903539560\)

\(=-903536185\)

\(626500:\left\{50^2:\left[178-4\cdot\left(35-21:3\right)\right]\right\}\)

\(=626500:\left\{50^2:\left[178-4\cdot\left(35-7\right)\right]\right\}\)

\(=626500:\left\{50^2:\left[178-4\cdot28\right]\right\}\)

\(=626500:\left\{50^2:\left[178-112\right]\right\}\)

\(=626500:\left\{50^2:66\right\}\)

\(=626500:\frac{1250}{33}\)

\(=\frac{82698}{5}\)

CHUC BAN HOC TOT >.<

1. \(\frac{x-3}{x+2}=\frac{3}{4}\)

=> \(4(x-3)=3(x+2)\)

=> 4x - 12 = 3x + 6

=> 4x - 12 - 3x = 6

=> 4x - 3x - 12 = 6

=> x = 18

2. \(\frac{4-x}{x-1}=\frac{-5}{6}\)

=> 6[4 - x] = -5[x - 1]

=> 24 - 6x = 5 - 5x

=> 24 - 6x - 5 = 5x

=> 24 - 5 = 6x - 5x

=> 19 = x

=> x = 19

3. \(\frac{3-x}{-x+2}=\frac{-1}{3}\)

=> 3[3 - x] = -1[-x + 2]

=> 9 - 3x = x - 2

=> 9 - 3x + x = -2

=> 9 - 4x = -2

=> 4x = 9 - [ -2]

=> 4x = 9 + 2 = 11

=> x = 11/4

4. \(\frac{x-1}{12}=\frac{-3}{1-x}\)

=> [x-1][1-x] = -36

=> -[x-1]² = -36

=> [x-1]² = 36

=> [x-1]² = 6²

=> x -1 = 6 hoặc x - 1 = -6

=> x = 7 hoặc x = -5

5 . |x - 3 | - 8 = -4

=> |x - 3| = -4 + 8

=> |x - 3| = 4

=> x - 3 = 4 hoặc x - 3 = -4

=> x = 7 hoặc x = -1

Mấy bài sau tương tự

dùng máy tính mà so sánh

3⁵⁰⁰=81¹⁰⁰;7³⁰⁰=243¹⁰⁰; =>3⁵⁰⁰<7³⁰⁰ 

5⁴⁰=625¹⁰;620¹⁰<625¹⁰=>5⁴⁰>620¹⁰

x-6-(48-24x2:6-3)=100

x-6-(48-8-3)=100

x-6-37=100

x-6=137

x=137+6=143

Vậy x=143

20-[7x(X-3)+4]=2

7x(X-3)+4=20-2

7x(X-3)+4=18

7x(X-3)=14

X-3=14:7

X-3=7

X=7+3=10

Vậy X=10

[(6.X-39):3].28=5628

(6.X-39):3=5628:28

(6.X-39):3=201

6.X-39=201.3=603

6.X=603+39

6.X=642

X=642:6=107

Vậy x=107

1)  \(x-6-\left(48-24.2:6-3\right)=100\Rightarrow x-6-\left(48-8-3\right)=100\)

\(\Rightarrow x-6-37=100\Rightarrow x=100+37+6=143\)

2)  \(20-\left[7\left(x-3\right)+4\right]=2\Rightarrow7\left(x-3\right)+4=20-2=18\)

\(\Rightarrow7\left(x-3\right)=18-4=14\Rightarrow x-3=14:7=2\Rightarrow x=2+3=5\)

3)   \(\left[\left(6x-39\right):3\right].28=5628\Rightarrow\left(6x-39\right):3=5628:28=201\)

\(\Rightarrow6x-39=201.3=603\Rightarrow6x=603+39=642\Rightarrow x=642:6=107\)

\(3(x-9)+15=12+243:3^2\)

=> 3x - 27 + 15 = 12 + 243 : 9

=> 3x - 27 + 15 = 12 + 27

=> 3x - 27 + 15 = 39

=> 3x - 27 = 39 - 15

=> 3x - 27 = 24

=> 3x = 24 + 27

=> 3x = 51

=> x = 51 : 3 = 17

Vậy x = 17

\(1170:(x-13)=339-3\cdot10^2\)

=> 1170 : [x-13] = 339 - 3 . 100

=> 1170 : [x - 13] = 339 - 300

=> 1170 : [x-13] = 39

=> x - 13 = 30

=> x = 43

a) 3 ( x - 9 ) + 15 = 12 + 243 : 3²

3 ( x - 9 ) + 15 = 12 + 27

3 ( x - 9 ) + 15 = 39

3 ( x - 9 ) = 39 - 15

3 ( x - 9 ) = 24

x - 9 = 24 : 3

x - 9 = 8

x = 8 + 9

x = 17

Vậy x = 17

b) 1170 : ( x - 13 ) = 339 - 3 . 10²

1170 : ( x - 13 ) = 339 - 300

1170 : ( x - 13 ) = 39

x - 13 = 1170 : 39

x - 13 = 30

x = 30 + 13

x = 43

Vậy x = 43

=))