1) x - 5,01 = 7,02 - 2.1,5

x - 5,01 = 4,02

x = 4,02 + 5,01

x = 9,03

2) x : 2,5 = 1,02 + 3.1,5

x : 2,5 = 5,52

x = 5,52 x 2,5

x = 13,8

\(\Rightarrow x-5,01=4,02\)

\(\Rightarrow x=4,02+5,01\)

\(\Rightarrow x=9,03\)

x-5,01=7,02-2.1,5

x-5,01=7,02-3

x-5,01=4,02

      x=4,02+5,01

      x=9,03

1) x - 5,01 = 7,02 - 2.1,5

x - 5,01 = 4,02

x = 4,02 + 5,01

x = 9,03

x-5,01=7,02-3

x-5,01=4,02

x=4,02+5,01

x=9,03

=>x-5,01=5,52

hay x=10,53

10.53

x-5,01=1,02+3×1,5

x - 5, 01 = 5,52

x = 5,52 + 5,01

x = 10,53

=>x-5,01=4,02

hay x=9,03

9.03

x=9.03 nhé

a, 1,23 * x -1,02 * x = 4,2

\(\Rightarrow x\cdot\left(1,23-1,02\right)=4,2\Rightarrow0,21\cdot x=4,2\Rightarrow x=\frac{420}{100}\div\frac{21}{100}=20\)

b, 11,95-x/2,5=7,35

\(\Rightarrow x\div\frac{25}{10}=11,95-7,35=4,6\Rightarrow x\div\frac{5}{2}=4,6\Rightarrow x=4,6\cdot\frac{5}{2}=\frac{46}{10}\cdot\frac{5}{2}=\frac{23}{5}\cdot\frac{5}{2}=\frac{23}{2}\)

a) = 20

b) = 9,01

Nhớ k nha ! ^_^

a, 1,23 x X -1,02 x X= 4,2

  (1,23-1,02) x 2X =4,2 

 0,21 x 2X=4,2

           2X=4,2:0,21

            2X=20

            X=20:2

             X=10

Vậy X= 10

b, 11,95-X:2,5=7,35

             X:2,5=11,95 - 7,35

             X:2,5=4,6

             X=4,6x2,5

             X=11,5

         Vậy X= 11,5

a)\(\left[{}\begin{matrix}\dfrac{5}{2}-x=\dfrac{1}{3}\\\dfrac{5}{2}-x=-\dfrac{1}{3}\end{matrix}\right.\left[{}\begin{matrix}x=\dfrac{13}{6}\\x=\dfrac{17}{6}\end{matrix}\right.\)

b) 8/6-x-1/5=0

9/6-x=1/5

x=13/10

a = 1,2

b = 1,8

a) \(\left|2,5-x\right|=1,3\)

\(\Leftrightarrow\left[{}\begin{matrix}2,5-x=1,3\\2,5-x=-1,3\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1,2\\x=3,8\end{matrix}\right.\)

b) \(1,6-\left|x-0,2\right|=0\)

\(\Leftrightarrow\left|x-0,2\right|=1,6\)

\(\Leftrightarrow\left[{}\begin{matrix}x-0,2=1,6\\x-0,2=-1,6\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1,8\\x=-1,4\end{matrix}\right.\)