5:

5000000m²=5km²

42dm²=4200cm²

54m²26dm²=5426dm²

2800dm²=28m²

a. \(\dfrac{-6}{11}+\dfrac{5}{-11}< --1\)

b. \(\dfrac{-5}{16}+\dfrac{-3}{16}>-\dfrac{1}{3}\)

c. \(\dfrac{2}{5}>\dfrac{3}{4}+-\dfrac{1}{6}\)

d. \(\dfrac{5}{6}+\dfrac{-2}{3}>\dfrac{1}{12}+\dfrac{-4}{5}\)

Câu 1:

a. $5\frac{1}{10}=5+\frac{1}{10}> 5=\frac{55}{11}> \frac{51}{11}$

Vậy dấu cần điền là > 

b. 

$\frac{3}{10}=\frac{6}{20}< \frac{6}{11}$

Câu 2:

a. $7m9mm = 7009mm$

$6ha15dam^2=6,15ha$

Lời giải chi tiết: 

8/11 + 5/7 + 3/11 + 2/7 - 5/5 = 1

\(\frac{8}{11}-\frac{5}{7}+\frac{3}{11}-\frac{2}{7}+\frac{5}{5}=1\)

\(V\text{ì}\frac{8}{11}+\frac{3}{11}-\left(\frac{5}{7}+\frac{2}{7}\right)+\frac{5}{5}=1\)

\(\frac{11}{11}-\frac{7}{7}+\frac{5}{5}=1\)

\(1-1+1=1\)

Ta có

kết quả là:

a. 7 + 4 = 11

b. 7 + 5 - 1 = 11

nha bn

7+4=11

7+5-1=11

1/ 

a, \(A=\dfrac{2}{3}+\dfrac{3}{4}.\left(-\dfrac{4}{9}\right)=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)

b, \(B=2\dfrac{3}{11}.\dfrac{11}{12}.\left(-2,2\right)=\dfrac{25}{11}.\dfrac{11}{12}.\left(-\dfrac{11}{5}\right)=-\dfrac{55}{12}\)

c, \(C=\left(\dfrac{3}{4}-0,2\right):\left(0,4-\dfrac{4}{5}\right)=\left(\dfrac{3}{4}-\dfrac{1}{5}\right):\left(\dfrac{2}{5}-\dfrac{4}{5}\right)=\dfrac{11}{20}:\left(-\dfrac{2}{5}\right)=-\dfrac{11}{8}\)

2/ 

a, \(\dfrac{11}{12}-x=\dfrac{2}{3}+\dfrac{1}{4}\\ \Rightarrow\dfrac{11}{12}-x=\dfrac{11}{12}\\ \Rightarrow x=0\)

b, \(2x\left(x-\dfrac{1}{7}\right)=0\\ \Leftrightarrow\left\{{}\begin{matrix}2x=0\\x-\dfrac{1}{7}=0\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x=0\\x=\dfrac{1}{7}\end{matrix}\right.\)

c, \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\\ \Rightarrow\dfrac{1}{4}:x=-\dfrac{7}{20}\\ \Rightarrow x=-\dfrac{5}{7}\)

câu b bài 1 là 1 1/12 là hỗn số nhen

Hung Vu

A = 1/11 + 1/12+ 1/13 + ...+ 1/30

=> A > 1/30 + 1/30 + 1/30 +...+1/30

A > 1/30 x 20

A > 2/3

Vậy A> 2/3

b) A = 1/11 + 1/12 + 1/13 + ..+ 1/30

A< 1/11 + 1/11 + 1/11+...+1/11

A < 1/11 x 20

A < 20/11

Mà 2 > 20/11

Nên suy ra A < 2 

^^ Học tốt ! 

Cho biểu thức   tổng là

A. 5                       B. 13                      C. 20                      D. 33