y=41/45

8/15

m=33/20

21/22 nhé

6/7

21/35 và 20/35 nhé

Câu 1:15/35=3/7

216/270=4/5

250/750=1/3

Câu 2:8/18,12/27,16/36,20/45,24/54

Câu 3:1/2=2/4=3/6=4/8=5/10

Câu 4:2×3×5/2×7×5=30/70=3/7

Tk mình nhé bn!

Bài 1:

\(\frac{15}{35}=\frac{3}{7}\)

\(\frac{216}{270}=\frac{4}{5}\)

\(\frac{250}{750}=\frac{1}{3}\)

Bài 2:

5 phân số bằng phân số \(\frac{4}{9}\) là: \(\frac{8}{18};\frac{12}{27};\frac{16}{36};\frac{20}{45};\frac{24}{54}\)

Bài 3:

\(\frac{1}{2};\frac{2}{4};\frac{3}{6};\frac{4}{8};\frac{5}{10}\)

Bài 4:

\(\frac{2x3x5}{2x7x5}=\frac{3}{7}\)

Bài 1:

a) \(x.\dfrac{3}{4}=\dfrac{9}{14}\)

\(\Rightarrow x=\dfrac{9}{14}:\dfrac{3}{4}\)

\(\Rightarrow x=\dfrac{6}{7}\)

b) \(x:\dfrac{5}{9}=\dfrac{3}{10}\)

\(\Rightarrow x=\dfrac{3}{10}.\dfrac{5}{9}\)

\(\Rightarrow x=\dfrac{1}{6}\)

help me

                   Đề Bài :\(\frac{9}{14}\)- \(\frac{x}{7}\): \(\frac{5}{3}\)= \(\frac{3}{14}\)

ta có : \(\frac{9}{14}\)- \(\frac{x}{7}\)= \(\frac{3}{14}\)x \(\frac{5}{3}\)= \(\frac{5}{14}\)

          \(\frac{x}{7}\)= \(\frac{9}{14}\)- \(\frac{5}{14}\)= \(\frac{4}{14}\)

         \(\frac{4}{14}\)= \(\frac{x}{7}\)=> \(\frac{4}{14}\)= \(\frac{2}{7}\)=> x = 2

Bài 1: Tính

\(a.\frac{15}{16}-\frac{7}{16}=\frac{15-7}{16}=\frac{8}{16}=\frac{1}{2}\)

\(b.\frac{7}{4}-\frac{3}{4}=\frac{7-3}{4}=\frac{4}{4}=1\)

\(c.\frac{9}{5}-\frac{3}{5}=\frac{9-3}{5}=\frac{6}{5}\)

\(d.\frac{17}{49}-\frac{12}{49}=\frac{17-12}{49}=\frac{5}{49}\)

Bài 2:Rút gọn rồi tính

\(a.\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{2-1}{3}=\frac{1}{3}\)

\(b.\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{7-3}{5}=\frac{4}{5}\)

Học tốt. K cho mik nha

Trl :

Bạn kia làm đúng rồi nhé !

Học tốt nhé bạn @

x/3 + 1/3 . 3/8 = 3/4

=> x . 1/3 + 1/3 . 3/8 = 3/4

=> ( x + 3/8 ) . 1/3 = 3/4

=> x + 3/8 = 9/4

=> x = 15/8

7/9:1/3-x/3=7/12

=> 7/3 - x : 3 = 7/12

=> x : 3 = 7/3 - 7/12 = 7/4

=> x = 7/4 . 3

=> x = 21/4

Câu 1

a)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)

b)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)

c)\(\frac{35}{8}\);\(\frac{21}{8}\);\(\frac{13}{13}\);\(\frac{9}{15}\);\(\frac{7}{15}\)

câu 2:

\(\frac{4}{15}\):\(\frac{4}{7}\)<x<\(\frac{2}{5}\)X\(\frac{10}{3}\)

\(\frac{7}{15}\)<x<\(\frac{4}{3}\)

Ta thấy \(\frac{7}{15}\)<1

              \(\frac{4}{3}\)  >1

nên để \(\frac{7}{15}\)<x<\(\frac{4}{3}\)

thì x=1

Vậy x=1