`18/5 + 6/35 = 126/35 + 6/35 = (126+6)/35=132/35`

18/5 + 6/35=126/35 +6/35 =[126 + 35 ] =132 / 35

a, 5/7 < 5/6 < 7/6 < 6/5

b, 1/2 < 5/8 < 3/4 <1

\(\dfrac{5}{7}\); \(\dfrac{5}{6}\); \(\dfrac{7}{6}\); \(\dfrac{6}{5}\)

\(\dfrac{1}{2}\) ; \(\dfrac{5}{8}\); \(\dfrac{3}{4}\); 1

Hiệu mới là:

45 + (12-6)= 51

Đáp số: 51

uk

Số bé nhất có `3` chữ số : `100`

Hiệu số phần bằng nhau:

`3-1=2(phần)`

Số thứ `1` :

`100:2xx3=150`

Hiệu của 2 số: 100

Hiệu số phần bằng nhau: 3-1=2 ( phần)

Số thứ nhất là: 100:2x3= 150

`2/3x - 1/2 = (-2/3)^2`

`2/3x - 1/2= 4/9`

`2/3x = 4/9+1/2`

`2/3x=17/18`

`x=17/18:2/3`

`x=17/18 xx 3/2`

`x=17/12`

\(\dfrac{2}{3}x-\dfrac{1}{2}=\left(-\dfrac{2}{3}\right)^2\)

\(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{4}{9}\)

\(\dfrac{2}{3}x=\dfrac{4}{9}+\dfrac{1}{2}\)

\(\dfrac{2}{3}x=\dfrac{17}{18}\)

x\(=\dfrac{17}{18}:\dfrac{2}{3}\)

x= \(\dfrac{17}{12}\)

Đề yêu cầu gì thế em?

x=8,1;8,2;8,3;8,4;8,5

\(8=\dfrac{8}{1}=\dfrac{8\times6}{1\times6}=\dfrac{48}{6}\)

\(9=\dfrac{9}{1}=\dfrac{9\times6}{1\times6}=\dfrac{54}{6}\)

\(\Rightarrow\dfrac{48}{6}< x< \dfrac{54}{6}\)

\(\Rightarrow x\in\left\{\dfrac{49}{6};\dfrac{50}{6};\dfrac{51}{6};\dfrac{52}{6};\dfrac{53}{6}\right\}\)

a) x - 4 = 34

x = 34 + 4

x = 38

b) 218 - x = 18

x = 218 - 18

x = 200

c) 420 + x = 420

x = 420 - 420

x = 0

\(x-1\inƯ\left(-3\right)=\left\{\pm1;\pm3\right\}\)

\(2x-1\inƯ\left(-4\right)=\left\{\pm1;\pm2;\pm4\right\}\)

Để cho \(\dfrac{-3}{x-1}\) nguyên \(\Leftrightarrow x-1\inƯ\left(-3\right)=\left\{\pm1;\pm3\right\}\)

Ta có bảng sau:

____

Để cho \(\dfrac{-4}{2x-1}\) nguyên \(\Leftrightarrow2x-1\inƯ\left(-4\right)=\left\{\pm1;\pm2;\pm4\right\}\)

Ta có bảng sau:

`(5/2 - 4/3).6/7 + (-3/2)^5 : (-3/2)^3`

`=(5/2 - 4/3).6/7 + \(\left(-\dfrac{3}{2}\right)^{5-3}\)

`=(5/2 - 4/3).6/7 +(-3/2)^2`

`=(15/6 - 8/6) . 6/7 + 9/4`

`=7/6 . 6/7 +9/4`

`=(7xx6)/(6xx7) + 9/4`

`=1+9/4`

`=4/4+9/4`

`=13/4`

\(\dfrac{5}{2}\) - \(\dfrac{4}{3}\) . \(\dfrac{6}{7}\)= \(\dfrac{5}{2}\) - \(\dfrac{8}{7}\) = \(\dfrac{35}{14}\) - \(\dfrac{16}{14}\) = \(\dfrac{19}{14}\)

(\(\dfrac{-3}{2}\))⁵ : (\(\dfrac{-3}{2}\))³ = (\(\dfrac{-3}{2}\))²  = \(\dfrac{9}{4}\)