x : 1/2 + x : 1/8 + x : 1/5 = 106.5

x * 2 + x * 8 + x * 5 = 106.5

15x = 106.5

x = 7.1

X : 50/100 + X : 0,125 + X : 20% = 106,5

X x 100/50 + X x 1000/125 + X x 100/20 = 106,5

X x (2 + 8 + 5) = 106,5

X = 106,5 : 15

X = 7,1

=X : 1/2 + X :1/8 + X : 1/5=106,5

=X: (1/2+1/8+1/5)=106,5

=X:33/40=106,5

X=106,5 x 33/40

X=7029/8000

50+50+50x100-20

=50x3x100-20

=150x100-20

=15000-20

=14980

50 + 50 + 50 x 100 - 20 = 50 x 100 + 50 + 50 - 20 = 5000 + 50 + 50 - 20 =5100 - 20 = 5080

hoặc là 50 + 50 + 50 x 100 - 20 = 50 x 2 + 50 x 100 - 20 = 5100 - 20 = 5080

100x50x20=100000

100  x 50 x 20 = 5000 x 20

                     = 100000

100 x 50 x 20 = 100 000

k mk nha ^_^

100 : 20 = 5

20 x 50 = 1000

k mik nha , mik k lại !!!!!!!!!!!!!!!!!!!!!!!!!!

100 : 20 = 5

20 x 50 = 1000

100 : 20 = 5

20 x 50 = 1000

ủng hộ nha 

a)X=100

b)X=70

K MKNHA BN

x + 20 - 10 = 110

x + 20 = 110 + 10

x + 20 = 120

x = 120 - 20

x = 100

x + 80 - 50 = 100

x + 80 = 100 + 50

x + 80 = 150

x = 150 - 80

x = 70

x+ 20= 110+10

x+20= 120

      x= 120-20

      x= 100

x+80= 100+50

x+80= 150

      x= 150-80

      x=70 

k nhé

a)50 + x = 180 - 120

 50 + x = 60

 x = 60-50 

 x = 10

b)20-x = 150-140

 20-x = 10

x = 20-10

x = 10

c) 25+x = 100-40

25+x=60

x= 60-25

x=35

d) 100+x =130-25

100+x = 105

x = 105-100

x = 5

e) 143+x = 174-22

143+x = 152

x = 152-143

x = 9 

ỦNG HỘ MK NHÁ

120 + ( 50 + x ) = 180

50 + x = 180 - 120

50 + x = 60

x = 60 - 50

x = 10

140 + ( 20 - x ) = 150

20 - x = 150 - 140

20 - x = 10

x = 20 - 10

x = 10

100 - ( 25 + x ) = 40

25 + x = 100 - 40

25 + x = 60

x = 60 - 25

x = 35

130 - ( 100 + x ) = 25

100 + x = 130 - 25

100 + x = 105

x = 105 - 100

x = 5

174 - ( 143 + x ) = 22

143 + x = 174 - 22

143 + x = 152

x = 152 - 143

x = 9

k mk nha 

Thanks nhìu

\(120+\left(50+x\right)=180\)

\(\Rightarrow50+x=180-120\)

\(\Rightarrow50+x=60\)

\(\Rightarrow x=60-50=10\)

Vậy x = 10

\(140+\left(20-x\right)=150\)

\(\Rightarrow20-x=150-140\)

\(\Rightarrow20-x=10\)

\(\Rightarrow x=20-10=10\)

Vậy x =x10

\(100-\left(25+x\right)=40\)

\(\Rightarrow25+x=100-40\)

\(\Rightarrow25+x=60\)

\(\Rightarrow x=60-25=35\)

Vậy x = 35

\(130-\left(100+x\right)=25\)

\(\Rightarrow100+x=130-25\)

\(\Rightarrow100+x=105\)

\(\Rightarrow x=105-100=5\)

Vậy x = 5

\(174-\left(143+x\right)=22\)

\(\Rightarrow143+x=174-22\)

\(\Rightarrow143+x=152\)

\(\Rightarrow x=152-143=9\)

Vậy x = 9

Chọn A

A

A nha!!!

X + 50 = 100 - 20

<=>x+50=80

=>x=80-50

=>x=30

x + 50 = 80

x        = 80 - 50

x        = 30

Vậy số cần tìm là 30.

X + 50 = 100 - 20

X + 50 = 80

X         = 80 - 50

X         = 30