\(Q=\frac{2014}{2015}\times3+\frac{2014}{2015}\times\frac{5}{6}-\frac{2014}{2015}\times\frac{10}{12}\)

\(Q=\frac{2014}{2015}\times\left(3+\frac{5}{6}-\frac{10}{12}\right)\)

\(Q=\frac{2014}{2015}\times3\)

\(Q=\frac{6042}{2015}\)

Q=2014/2015x(3 +5/6 - 10/12)

Q= 2014/2015x 3

Q= 6042/2015

\(\left(2002+2003+2004+2005+2006\right)\times\left(1015-x\times5\right)=0\)

\(\Rightarrow1015-x\times5=0\)

\(\Rightarrow x\times5=1015\)

\(\Rightarrow x=1015\div5\)

\(\Rightarrow x=203\)

\(\text{(2002 +2003+2004+2005+2006).(1015-x.5)=0}\)

\(\Rightarrow1015-x.5=0\)

\(\Rightarrow x.5=1015\)

\(x=203\)

P/s : Hok tốt a~

a ,   x − 25 100 = 28 10 + 123 10 x − 0 , 25 = 2 , 8 + 12 , 3 x − 0 , 25 = 15 , 1 x = 15 , 1 + 0 , 25 x = 15 , 35 b ,   x + 21 10 = 11 × 5 10 x + 2 , 1 = 55 10 x + 2 , 1 = 5 , 5 x = 5 , 5 − 2 , 1 x = 3 , 4

\(125-2x=25\\ 2x=125-25\\ 2x=100\\ x=50\\ 100-\left(x+15\right)=27\\ x+15=100-27\\ x+15=73\\ x=73-15\\ x=58\)

\(125-2x=25\Leftrightarrow-2x=25-125\Leftrightarrow-2x=-100\Leftrightarrow x=\dfrac{-100}{-2}=50\)

\(100-\left(x+15\right)=27\Leftrightarrow-\left(x+15\right)=27-100\Leftrightarrow-\left(x+15\right)=-73\Leftrightarrow x+15=73\Leftrightarrow x=73-15\Leftrightarrow x=58\)

a)  x − 25 100 = 28 10 + 123 10

x − 0 , 25 = 2 , 8 + 12 , 3

x − 0 , 25 = 15 , 1

x = 15 , 1 + 0 , 25

x = 15 , 35

b)  x + 21 10 = 11 × 5 10

x + 2 , 1 = 55 10

x + 2 , 1 = 5 , 5

x = 5 , 5 − 2 , 1

x = 3 , 4

2x=100=>x=50

100-x-15=27=>88 nhé

a)125 - 2x = 25

            2x=125-25

            2x=100

            x=100:2

            x=50

100 - (x + 15) = 27

             x+15=100-27

             x+15=73

                  x=73-15

                  x=58

a) \(x-53+x-527+x-519=0\\ \Rightarrow3x-1099=0\\ \Rightarrow x=\dfrac{1099}{3}\)

b) \(x+1015+x-1035+x-1237=-3\\ \Rightarrow3x-1257=-3\\ \Rightarrow3x=-1260\\ \Rightarrow x=-420\)

c) \(x+120+x+129+x+318=x+417+x+516+x+615\\ \Rightarrow x+120+x+129+x+318-x-417-x-516-x-615=0\\ \Rightarrow-981=0\left(vôlí\right)\)

a. x - 53 + x - 517 + x - 519 = 0

<=> x + x + x = 519 + 517 + 53

<=> 3x = 1089

<=> x = 363

b. x + 1015 + x - 1035 + x - 1237 = -3

<=> x + x + x = -3 - 1015 + 1035 + 1237

<=> 3x = 1254

<=> x = 418

c. x + 120 + x 219 + x + 318 = x + 417 + x + 516 + x + 615

<=> x + x - x - x - x = 417 + 516 + 615 - 120 - 219 - 318

<=> -x = 891

<=> x = -891

d. Ko có kết quả ko tìm đc x nha bn, bn xem lại đề rồi nhắc mik.

a: Ta có: \(x-53+x-517+x-519=0\)

\(\Leftrightarrow3x=1089\)

hay x=363

b: Ta có: \(x+1015+x-1035+x-1237=-3\)

\(\Leftrightarrow3x=-1260\)

hay x=-420

cách làm như thế này :

11 x 113 - 5 x 116 = 663

116 - 113 = 3

663 : 3 = 211