=15✖(26-6)

=15✖20

=300

15 \(\times\) ( 26 - 6 ) = 15 \(\times\) 20 = 300

300v

\(...=15x\left(26+74\right)=15x100=1500\)

   15 x 26 + 15 x 74

= 15 x (26 + 74)

= 15 x 100

= 1500

\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)

\(\Leftrightarrow\frac{x}{13}=\frac{8}{26}\)

\(\Leftrightarrow\frac{x}{13}=\frac{4}{13}\)

\(\Leftrightarrow x=4\)

\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)

\(\Leftrightarrow\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)

\(\Leftrightarrow\frac{x}{13}=\frac{8}{26}\)

\(\Leftrightarrow\frac{2x}{26}=\frac{8}{26}\)

\(\Leftrightarrow2x=8\)

\(\Leftrightarrow x=8:2\)

\(\Leftrightarrow x=4\)

Ko ghi lại đề bài:

\(=>\frac{x}{13}=\frac{8}{26}\)

\(=>\frac{x}{13}=\frac{4}{13}\)

\(=>x=4\)

\(=\dfrac{12}{15}\times\left(\dfrac{26}{11}-\dfrac{9}{11}-\dfrac{6}{11}\right)=\dfrac{12}{15}\times\dfrac{11}{11}=\dfrac{12}{15}=\dfrac{4}{5}\)

= 12/15 x (26/11 - 9/11 - 6/11)

= 12/15 x 11/11

= 12/15

help

4862 : ( 127*x*15) = 26 

             127*x*15 = 4862 : 26 = 187

              x*1905 = 187

                     x    = 187 : 1905

                     x    =  187/1905

Khó qué

4862 : ( 127*x*15) = 26 

             127*x*15 = 4862 : 26 = 187

              x*1905 = 187

                     x    = 187 : 1905

                     x    =  187/1905

Tối giản rồi nha 

---------------------------------HT-------------------------------

`@` `\text {Ans}`

`\downarrow`

Lớp 6 - 8 phải k ạ? Lớp 5 chưa học dạng ntnay.

\(15 . ( x- 3 ) + 3 (x+ 26 ) = 19 . ( x + 1)\)

`=>`\(15x-45+3x+78=19x+19\)

`=> 15x - 45 + 3x + 78 - 19x - 19 = 0`

`=> (15x + 3x - 19x) + (-45 + 78 - 19) = 0`

`=> -x + 14 = 0`

`=> -x = -14`

`=> x = 14`

Vậy, `x = 14.`

= \(\frac{13}{45}x\left(\frac{15}{26}-1\frac{1}{26}+\frac{11}{26}\right)=\frac{13}{45}x\left(\frac{15}{26}-\frac{27}{26}+\frac{11}{26}\right)=\frac{13}{45}x\left(\frac{27}{26}-\frac{27}{26}\right)=\frac{13}{45}x0=0\)

26/x=−13/−15
x= 26.-15/-13 = 30

=26/15;-26/15 nha bạn