Question

Tìm x

25÷x=x           3358÷23=2x-6

2782÷[216-(x-3)]=13

Answer 1

\(25\div x=x\Leftrightarrow25=x.x\Leftrightarrow25=x^2\)

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

\(3358\div23=2x-6\)

\(\Leftrightarrow146=2x-6\)

\(\Leftrightarrow2x=152\Leftrightarrow x=76\)

\(2782\div\left[216-\left(x-3\right)\right]=13\)

\(\Leftrightarrow216-\left(x-3\right)=214\)

\(\Leftrightarrow x-3=2\)

\(\Leftrightarrow x=5\)

Answer 2

25:x=x=>x²=25=>x=5

3358:23=2x-6=>2x-6=146=>2x=152=>x=76

2782:[216-(x-3)=13

=>2782:13=216-(x-3)

=>214      =216-(x-3)

=>216-214= x-3

=>x-3 =2

=>x=5

Tk nha, thanks nhìu ^_^

Answer 3

+) 25 : x = x

25 = x^2

=> x = 5; -5

+) 3358 : 23 = 2x - 6

146 = 2x - 6

2x = 152

x = 76

+) 2782 : [ 216 - ( x - 3 ) ] = 13

2782 : [ 216 - x + 3 ] = 13

219 - x = 214

x = 5

Answer 4

25:x=x ; => 25=x^2 ; mà 25 = 5^2 ; =>x=53358:23=2x-6 ; => 146=2x-6 ; 2x = 146+6=152 ; x=152:2 ; x=76