Bài làm :

\(a,\left(7x-7\right)\left(x-3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}7x-7=0\\x-3=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=3\end{cases}}\)

Vậy x = 1 hoặc x = 3 .

\(b,108-18x=54\)

\(18x=108-54\)

\(18x=54\)

\(x=54:18\)

\(x=3\)

\(c,35.\left(x-10\right)=35\)

\(x-10=35:35\)

\(x-10=1\)

\(x=1+10\)

\(x=11\)

\(d,3x+5x=40\)

\(\left(3+5\right)x=40\)

\(8x=40\)

\(x=40:8\)

\(x=5\)

Học tốt

a. ( 7x - 7 ) ( x - 3 ) = 0

<=>\(\orbr{\begin{cases}7x-7=0\\x-3=0\end{cases}}\)<=>\(\orbr{\begin{cases}x=1\\x=3\end{cases}}\)

b. 108 - 18x = 54

=> 18x = 54

=> x = 3

c. 35 ( x - 10 ) = 35

=> x - 10 = 1

=> x = 11

d. 3x + 5x = 40

=> 8x = 40

=> x = 5 

a) (7x-7).(x-3)=0

\(\Leftrightarrow\orbr{\begin{cases}7x-x=0\\x-3=0\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}6x=0\\x=3\end{cases}}\)\(\orbr{\begin{cases}x=0\\x=3\end{cases}}\)

vậy \(x\in\){0,3}

| x + 4 | + 6x = 13

| x + 4 | = 13 - 6x

\(\orbr{\begin{cases}x+4=13-6x\\x+4=-\left(13-6x\right)\end{cases}}\Rightarrow\orbr{\begin{cases}x+6x=13-4\\x+4=-13+6x\end{cases}}\)

\(\orbr{\begin{cases}7x=9\\x-6x=-13-4\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{9}{7}\\-5x=-17\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{9}{7}\\x=\frac{17}{5}\end{cases}}\)

9 x 5 = 45

63 : 7 = 9

8 x 8 = 64

5 x 7 = 35

8 x 7 =56

3 x 8 = 24

40 : 5 = 8

5 x 5 = 25

7 x 5 = 35

7 x 8 =56

6 x 4 = 24

45 : 9 = 5

7 x 7 = 49

35 : 5 = 7

56 : 8 = 7

2 x 8 = 16

81 : 9 = 9

9 x 9 = 81

35 : 7 = 5

56 : 7 = 8

ay bạn ơi dễ vậy mà

Câu 1:

\(\frac{x+16}{35}=\frac{x}{7}\)

\(\frac{x+16}{35}=\frac{5x}{35}\)

\(x+16=5x\)

\(5x-x=16\)

\(4x=16\)

\(x=\frac{16}{4}\)

\(x=4\)

Câu 2:

\(-2x^2+40=-10\)

\(-2x^2=-10-40\)

\(-2x^2=-50\)

\(x^2=\frac{-50}{-2}\)

\(x^2=25\)

\(x^2=\left(\pm5\right)^2\)

\(x=\pm5\)

Vậy x = 5 hoặc x = - 5.

Chúc bạn học tốt

102 - (35 + x) = 40

35 + x = 102 - 40

35 + x = 62

x = 62 - 35

x = 27

\(102-\left(35+x\right)=40\\ 35+x=102-40\\ 35+x=62\\ x=62-35\\ x=27\)

102 - (35 + x) = 40

=> 35 + x = 62

=> x = 27 

x = 35 : 7 = 5

x = 16 + 4 = 20

x = 20 : 5 

x = 4

tích trước trả lời sau

Ta có : (x + 16).7 = 35x

      => 16x + 112 = 35x

     => 112 = 35x - 16x

     => 19x = 112

     => x = 112 : 19