hỏi google phay

Hỏi gg đi khó lắm

\(\frac{19}{20}-x+\frac{3}{4}=\frac{8}{5}\)

\(\frac{19}{20}-x=\frac{8}{5}-\frac{3}{4}\)

\(\frac{19}{20}-x=\frac{17}{20}\)

\(x=\frac{19}{20}-\frac{17}{20}\)

 \(x=\frac{1}{10}\)

\(\frac{19}{20}-x+\frac{3}{4}=\frac{8}{5}\)

\(1,7-x=1,6\)

\(x=1,7-1,6\)

\(x=0,1\)

Hình như đề bài sai thì phải.

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\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)

\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)

\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)

\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)

a. \(\frac{3}{4}+\frac{5}{9}\div\frac{4}{5}=\frac{3}{4}+\frac{25}{36}=\frac{13}{9}.\)

b. \(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)

đúng rồi bạn k mk nha

phếp tính trreen là đúng

x+1/2=3/4
x=3/4-1/2
x=1/4

x + 1/2 = 3/4

x           = 3/4 - 1/2

x           = 1/4

Vậy, x = 1/4

T.i.c.k cho mik nha!

~ Hok tốt ~

5/4:x=6/3

=>5/4:x=2

=>x=5/8

x x 3/4 = 11/7 : 3/2 

x x 3/4 = 22/21

         x = 22/21 :3/4 

         x = 88/63

\(\frac{7}{5}:x=\frac{4}{3}\times\frac{2}{3}\)

\(\frac{7}{5}:x=\frac{8}{9}\)

\(x=\frac{7}{5}:\frac{8}{9}\)

\(x=\frac{63}{40}\)