x + 5,22 = 9,08

x = 9,08 - 5,22

x = 3,86

x + 5,22 = 9,08 
           x = 9, 08 - 5,22 
           x = 3,86
 ~ HT~

làng nhăng quá

mik xl bn ạ 

\(4\dfrac{2}{5}+3\dfrac{1}{10}=\dfrac{22}{5}+\dfrac{31}{10}=\dfrac{44}{10}+\dfrac{31}{10}=\dfrac{75}{10}=\dfrac{15}{2}\)

\(7\dfrac{3}{8}-5\dfrac{1}{4}=\dfrac{59}{8}-\dfrac{21}{4}=\dfrac{59}{8}-\dfrac{42}{8}=\dfrac{17}{8}\)

\(3\dfrac{2}{9}\)x\(4\dfrac{3}{5}=\)\(\dfrac{29}{9}\)x\(\dfrac{23}{5}=\)\(\dfrac{667}{45}\)

\(5\dfrac{2}{9}:4\dfrac{1}{2}=\dfrac{47}{9}:\dfrac{9}{2}=\dfrac{47}{9}\)x\(\dfrac{2}{9}\)\(=\dfrac{94}{81}\)

\(1\dfrac{3}{8}\) tấn \(=\dfrac{55}{3}\) tạ

\(13\dfrac{3}{4}\) tạ \(=\dfrac{55}{4}\) tạ

Mà:\(\dfrac{55}{3}>\dfrac{55}{4}\)

Vậy:\(1\dfrac{3}{8}\) tấn \(>13\dfrac{3}{4}\) tạ

Đáp án:

\(1\) \(\dfrac{3}{8}\) tấn = \(\dfrac{55}{3}\) tạ      \(13\) \(\dfrac{3}{4}\) tạ = \(\dfrac{55}{4}\) tạ

Mà: \(\dfrac{55}{3}\) > \(\dfrac{55}{4}\)

Vậy : 1\(\dfrac{3}{8}\) tấn > 13\(\dfrac{3}{4}\) tạ

-CHÚC BẠN HỌC TỐT-

x:4/5=5

x=5x4/5

x=4

a ) x : 4/5 = 25/4 : 5/4  => x : 4/5 = 25/4 x 4/5  
                                          x : 4/5 = 5 
                                                x = 5 x 4/5 
                                                x = 4

Chu vi mảnh đất hình chữ nhật là:

             \(\left(15\dfrac{1}{2}+\dfrac{1}{3}\right)\)x\(2\)=\(\dfrac{95}{6}\left(m\right)\)

Diện tích mảnh đất hình chữ nhật là:

               \(15\dfrac{1}{2}\)x\(\dfrac{1}{3}=\)\(\dfrac{31}{3}\)\(\left(m^2\right)\)

                      Đ/s:...

chiều dài hcn là 15 x 2 +1=31                                                                          chu vi là: 31+1/3=94/3                                                                                     diện tích là: 31x1/3=31/3                                                                                lời giải chưa vết đủ

\(a,\)

\(MSC:42\)

\(\dfrac{4}{7}=\dfrac{4.6}{7.6}=\dfrac{24}{42}\)

\(\dfrac{5}{6}=\dfrac{5.7}{6.7}=\dfrac{35}{42}\)

\(b,\)

\(MSC:12\) 

\(\dfrac{5}{12}\) giữ nguyên

\(\dfrac{2}{3}=\dfrac{2.4}{3.4}=\dfrac{8}{12}\)

\(c,\)

\(MSC:24\)

\(\dfrac{3}{4}=\dfrac{3.6}{4.6}=\dfrac{18}{24}\)

\(\dfrac{5}{6}=\dfrac{5.4}{6.4}=\dfrac{20}{24}\)

b 5/12 và 2/3 đây là ý b

\(\dfrac{4}{7}\)  và \(\dfrac{5}{6}\)

\(MSC:42\)
\(\dfrac{4}{7}=\dfrac{4.6}{7.6}=\dfrac{24}{42}\)

\(\dfrac{5}{6}=\dfrac{5.7}{6.7}=\dfrac{35}{42}\)

\(\dfrac{3}{4}+\dfrac{5}{6}=\dfrac{18}{24}+\dfrac{20}{24}=\dfrac{38}{24}=\dfrac{19}{12}\)

\(\dfrac{7}{6}-\dfrac{5}{9}=\dfrac{63}{54}-\dfrac{30}{54}=\dfrac{33}{54}=\dfrac{11}{18}\)

\(\dfrac{6}{25}\)x\(\dfrac{15}{8}=\)\(\dfrac{90}{200}=\dfrac{9}{20}\)

\(\dfrac{24}{35}:\dfrac{15}{7}=\dfrac{24}{35}\)x\(\dfrac{7}{15}=\)\(\dfrac{168}{525}=\dfrac{56}{175}\)

câu cuối chọn a.72/49 b.8/25 c.25/8 d.9/28 chọn cái nào ?

\(4\dfrac{1}{2}:2\dfrac{1}{2}=\dfrac{9}{2}:\dfrac{5}{2}=\dfrac{9}{2}\)x\(\dfrac{2}{5}=\)\(\dfrac{18}{10}=\dfrac{9}{5}\)

\(1\dfrac{1}{2}+\dfrac{1}{2}=\dfrac{3}{2}+\dfrac{1}{2}=\dfrac{3+1}{2}=\dfrac{4}{2}=2\)

Mà: \(\dfrac{9}{5}< 2\)

Vậy:\(4\dfrac{1}{2}:2\dfrac{1}{2}< 1\dfrac{1}{2}+\dfrac{1}{2}\)