Question

2x-49=5.3² ,200-(2x+6)=4³,5(x-9)=300,                  450:(x19)=50,198-(x+4)=120,140:(x-8)=7,          11(x-7)=77,(6x-39):3=281 tim x nha

Answer 1

2x−49=5.3²

⇔2x−49=5.9

⇔2x−49=45

⇔2x=94

⇔x=47

 

200−(2x+6)=4³

⇔2x+6=136

⇔2x=130

⇔x=65

mik chỉ biết 2 ý đầu thui

xin lỗi

Answer 2

c) \(5.\left(x-9\right)=300\)

\(\Leftrightarrow\left(x-9\right)=300:5\)

\(\Leftrightarrow x-9=60\)

\(\Leftrightarrow x=60+9\)

\(\Leftrightarrow x=69\)

Vậy \(x=69.\)

d) x19 là sao bạn?

e) \(198-\left(x+4\right)=120\)

\(\Leftrightarrow\left(x+4\right)=198-120\)

\(\Leftrightarrow x+4=78\)

\(\Leftrightarrow x=78-4\)

\(\Leftrightarrow x=74\)

Vậy \(x=74.\)

f) \(140:\left(x-8\right)=7\)

\(\Leftrightarrow\left(x-8\right)=140:7\)

\(\Leftrightarrow x-8=20\)

\(\Leftrightarrow x=20+8\)

\(\Leftrightarrow x=28\)

Vậy \(x=28.\)

g) \(11.\left(x-7\right)=77\)

\(\Leftrightarrow\left(x-7\right)=77:11\)

\(\Leftrightarrow x-7=7\)

\(\Leftrightarrow x=7+7\)

\(\Leftrightarrow x=14\)

Vậy \(x=14.\)

h) \(\left(6x-39\right):3=281\)

\(\Leftrightarrow\left(6x-39\right)=281.3\)

\(\Leftrightarrow6x-39=843\)

\(\Leftrightarrow6x=843+39\)

\(\Leftrightarrow6x=882\)

\(\Leftrightarrow x=882:6\)

\(\Leftrightarrow x=147\)

Vậy \(x=147.\)