\(x\times x-5+x:x=12\)

\(\Rightarrow x\times x-5+1=12\)

\(\Rightarrow x\times x=12+5-1\)

\(\Rightarrow x\times x=17-1\)

\(\Rightarrow x\times x=16\)

\(\Rightarrow x\times x=4\times4\)

\(\Rightarrow x=4\).

53,2:(x-3,5)+45,8=99

=>53,2:(x-3,5)=53,2

=>x-3,5=1

=>x=4,5

vậy x=4.5

53,2 : ( X- 3,5) +45,8 = 99

53,2 : (X- 3,5)            = 99- 45,8

53,2 : (X- 3,5)            = 53,2

          X- 3,5              = 53,2: 53,2

          X- 3,5              = 1

          X                      = 1+ 3,5

          X                      = 4,5

Tk cho mk nhé ^^

I don`t now

(8 x 18 - 5 x 18 - 18 x 3)x + 2x = 8 x 7 + 24

<=> [18 x (8 - 5 - 3)]x + 2x =   80

<=> 2x = 80

<=> x = 40,k nhé bạn

(8x18-5x18-18x3)xX+2xX=8x7+24

=>8x(8-5-3)xX+2xX=80

=>8x0xX+2xX=80

=>0+2xX=80

=>X=80:2

=>X=40

 X x ( 3,7 + 6,3 ) = 120

X x 10 = 120

X = 120 : 10

X = 12

Vậy X = 12

a 48

b 

c 

tự làm đừng hỏi

4,25 x (X+ 41,53) - 125= 53,5

4,25 x (X+ 41,53)= 53,5+ 125

4,25 x (X+ 41,53) = 178,5

X+ 41,53= 178,5: 4,25

X+ 41,53= 42

X= 42- 41,53

X= 0,47

Tk cho mk nhé ^^

4,25x(X+41,53)-125=53,5

4,25x(X+41,53)=53,5+125

4,25x(X+41,53)=178,5

X+41,53=42

X=0,47

#H

\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\)\(\left(4+x\right)+\left(5+x\right)=10\times5\)

\(\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)

\(15+5x=50\)

\(5x=35\)

\(x=7\)

Vậy \(x=7\)

\(\left(1+x\right)+\left(2+x\right)+\left(3+x\right)+\left(4+x\right)+\left(5+x\right)=10\times5\)

\(\Rightarrow1+x+2+x+3+x+4+x+5+x=50\)

\(\Rightarrow\left(1+2+3+4+5\right)+\left(x+x+x+x+x\right)=50\)

\(\Rightarrow15+5x=50\)

\(\Rightarrow5x=50-15\)

\(\Rightarrow5x=35\)

\(\Rightarrow x=35:5\)

\(\Rightarrow x=7\).

=m x 1+ m x 2+ 3 x m + 4 x m=210

=m x(1+2+3+4)=210

=m x 10= 210

m=210:10=21

tk nha

=mx1+mx2+3xm+4xm=+210

= m X ( 1+2+3+4 =210

=mx10=210

=210:5

=.........

m+m:m-mx2-mx3=4

=>m+1-2m-3m=4

=>-4m=3

=>m=-3/4

nhầm thay = 49 nhé

m+m:m-mx2-mx3=49

=m+1-2m -3m=49

=>-4m=48

=>m=12