Question

Tìm y :

y + y x 1/4 : 2/7 + y : 2/9 = 255 

Ai làm được mik cho 3 tick !!!

Answer 1

Dấu \(.\)là dấu nhân 

\(y+y.\frac{1}{4}:\frac{2}{7}+y:\frac{2}{9}=255\)

\(\Rightarrow y+y.\frac{1}{4}.\frac{7}{2}+y.\frac{9}{2}=255\)

\(\Rightarrow y+y.\frac{7}{8}+y.\frac{9}{2}=255\)

\(\Rightarrow y.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)

\(\Rightarrow y.\left(\frac{8}{8}+\frac{7}{8}+\frac{36}{8}\right)=255\)

\(\Rightarrow y.\frac{51}{8}=255\)

\(\Rightarrow y=255:\frac{51}{8}\)

\(\Rightarrow y=255.\frac{8}{51}\)

\(\Rightarrow y=40\)

Vậy \(y=40\)

~ Ủng hộ nhé 

Answer 2

y bằng 40 đó bạn nhé9

Answer 3

\(y+y\cdot\frac{1}{4}:\frac{2}{7}+y:\frac{2}{9}=225\)

\(y+y\cdot\frac{1}{4}\cdot\frac{2}{7}+y\cdot\frac{9}{2}=225\)

\(y+y\cdot\frac{1}{14}+y\cdot\frac{9}{2}=225\)

\(y\cdot\left(1+\frac{1}{14}+\frac{9}{2}\right)=225\)

\(y\cdot\frac{39}{7}=225\)

\(y=225\cdot\frac{7}{39}\)

\(y=\frac{525}{13}\)

Dấu . là dấu nhân

Answer 4

y+y x 7/8 + y x 9/2 = 255

y x ( 1+ 7/8 + 9/2 ) = 255

y x      51/8             = 255

           y                  = 255 : 51/8

          y                   =    40

Answer 5

y+yx1/4:2/7+y:2/9=255

y+yx1/4x7/2+yx9/2=255

yx(1+1/4x7/2+9/2)=255

yx51/8=255

y=255:51/8

y=255x8/51

y=8

Answer 6

Sorry mn chép nhầm đề

Answer 7

y + y x 1/4 x 7/2 + y x 9/2 = 255

y + y x 7/8 + y x 9/2 = 255

y x ( 1 + 7/8 + 9/2)=255

y x  51/8 = 255

y = 255 / (51/8)

y = 40

Answer 8

40 mới là đáp án đúng , ai được kq khác là sai rồi nhé !

Answer 9

\(y+y.\frac{1}{4}:\frac{2}{7}+y:\frac{2}{9}=255\)

\(y+y.\frac{7}{8}+y.\frac{9}{2}=255\)

\(y.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)

\(y.\left(\frac{8}{8}+\frac{7}{8}+\frac{36}{8}\right)=255\)

\(y.\frac{51}{8}=255\)

\(y=255:\frac{51}{8}\)

\(y=255.\frac{8}{51}\)

\(y=\frac{3.17.5.8}{3.17}\)

\(y=40\)