x=2

a) (10-x)²:3+3=-9

    (10-x)²:3=-9-3

    (10-x)²:3=-11

    (10-x)²=-11.3

    (10-x)²=-33

 Vô lí vì -33 ko chuyển đc mũ 2 

Vậy x e 0

b) |x-6|.7-4=31

    |x-6|=(31+4):7

    |x-6|=5

\(\Rightarrow\orbr{\begin{cases}x-6=5\Rightarrow5+6=11\\x-6=-5\Rightarrow x=-5+6=1\end{cases}}\)

Vậy.....................................................

a) \(\frac{\left(10-x\right)^2}{3}+3=-9\)

\(\Leftrightarrow\frac{\left(10-x\right)^2}{3}=-12\)

\(\Leftrightarrow\left(10-x\right)^2=-36\)( vô nghiệm vì (10-x)² \(\ge\)0 với mọi x thuộc Z)

b) |x-6|.7-(-2)²=-8+39

<=> |x-6|.7-4=31

<=> |x-6|.7=35

<=> |x-6|=5

\(\Leftrightarrow\orbr{\begin{cases}x-6=5\\x-6=-5\end{cases}\Leftrightarrow\orbr{\begin{cases}x=11\\x=1\end{cases}}}\)

số 14 nha bạn ~~~

mày tên gì tau trả lời cho

 Troi a gio hoi ten moi bao bai ha  

Thoi giup to di choc to se bao ten cho

a) \(\dfrac{x}{15}\)=\(\dfrac{x-2}{30}\)

=>30x=15 (x-2)

=>30x=15x-30

=>30x-15x=-30

=>15x =-30

=>x =-2

b)\(\dfrac{7}{8}\)<\(\dfrac{x}{80}\)<\(\dfrac{9}{10}\)

=>\(\dfrac{70}{80}\)<\(\dfrac{x}{80}\)<\(\dfrac{72}{80}\)

=> 70<x<72

=>x=71

c)\(\dfrac{1}{6}\)<\(\dfrac{5}{x}\)<\(\dfrac{1}{4}\)

=>\(\dfrac{5}{30}\)<\(\dfrac{5}{x}\)<\(\dfrac{5}{20}\)

=>20<x<30

=>x={21;22;23;24;25;26;27;28;29}

\(\frac{1}{6}=\frac{x}{18}\Rightarrow x=3\)

\(\frac{x}{8}=-\frac{1}{4}\Rightarrow x=-2\)

\(\frac{4}{-5}=\frac{x}{10}\Rightarrow x=-8\)

\(\frac{11}{5}=-\frac{22}{x}\Rightarrow x=-10\)

\(\frac{x}{8}=\frac{8}{x}\Rightarrow x^2=64\Rightarrow x=8\)

\(\frac{x}{-11}=-\frac{11}{x}\Rightarrow x^2=121\Rightarrow x=11\)

#H

X = 2015/8

a. x -6 = 35 : 7 + 42 : 6 

=> x - 6 = 5 + 7 

=> x -6 = 12 

=> x     = 12 + 6 

=> x     = 18 

Các câu sau tương tự, bạn học tốt nha! .-. 

a)x-6=5+7

x-6=12

x=6.

b)x-2=42-13

x-2=29

x=29+2

x=31

c)(36+81):x=13

117:x=13

x=117:13

x=9.

a)x-6=35:7+42:6

x-6=5+7

x-6=12

x=12:6

x=2

Vậy x=2