x- \(\dfrac{1}{2}\) = 6 x \(\dfrac{1}{24}\)

x- 0,5 = 6 x \(\dfrac{1}{24}\)

x- 0,5 = \(\dfrac{1}{4}\) 

x- 0,5 = 0,25

x        = 0,25+0,5

x        =0,3

x - 1/2 = 6 x 1/24 

x - 0,5 = 1/4

x - 0,5 = 0,25 

x = 0,25 + 0,5 

x = 0,3

\(x^2-x^2+3x+1=0\)

\(\Leftrightarrow3x+1=0\)

\(\Leftrightarrow3x=-1\)

\(\Leftrightarrow x=-\dfrac{1}{3}\)

Lời giải:

Đổi 2,4m=24dm
Diện tích toàn phần hình hộp là:

$2\times 25\times 24+2\times 25\times 16+2\times 24\times 16=2768$ (dm²)

cam on nhe

7/15 + 4/15 = 11/15

13/5 - 2 = 13/5 - 10/5 = 3/5

4/7 x 5/8 = 20/56=5/14

8/3 : 8 = 8/3 x 1/8 = 8/24 = 1/3

9025 dm³

   \(a,x-452=77\\ x=77+452\\ x=529\)

  \(b,x+58=64\\ x=64+58\\ x=122\)

 \(c,x-1-2-3-4\\ x=1+2+3+4\\ x=10\)

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{5}{6}\)

\(=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{5}{6}\)

\(=\dfrac{5}{6}\times\dfrac{5}{6}\)

\(=\dfrac{10}{12}\)

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)\times\dfrac{5}{6}\)

\(=\left(\dfrac{3}{6}+\dfrac{2}{6}\right)\times\dfrac{5}{6}\)

\(=\dfrac{5}{6}\times\dfrac{5}{6}\)

\(=\dfrac{25}{36}\)

\(\left(\dfrac{1}{2}+\dfrac{1}{3}\right)x\dfrac{5}{6}=\dfrac{5}{6}x\dfrac{5}{6}=\dfrac{25}{36}\)