\(x^2+10x+25\)

\(=x^2+2.5x+5^2\)

\(=\left(x+5\right)^2\)

`x^2 +10x + 25`

`=x^2 + 2.5.x + 25`

`=(x+5)^2`

`x+2.x+3.x+4.x=3708.100`

`1.x+2.x+3.x+4.x=370800`

`(1+2+3+4).x = 370800`

`10.x = 370800`

`x=370800:10`

`x=37080`

giúp mình với

\(4)25-1^2=\left(5-1\right)\left(5+1\right)=4.6=24\\ 5)a^2-9=a^2-3^2=\left(a-3\right)\left(a+3\right)\)

\(\dfrac{17}{103}< \dfrac{19}{113}\)

c)\(0,625+\left(\dfrac{-2}{7}\right)+\dfrac{3}{8}+\left(-\dfrac{5}{7}\right)+1\dfrac{2}{3}\)

\(=\dfrac{5}{8}-\dfrac{2}{7}+\dfrac{3}{8}-\dfrac{5}{7}+\dfrac{5}{3}\)

\(=\left(\dfrac{5}{8}+\dfrac{3}{8}\right)-\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\dfrac{5}{3}\)

\(=1-1+\dfrac{5}{3}\)

\(=\dfrac{5}{3}\)

d)\(\left(-3\right).\left(\dfrac{-38}{21}\right).\left(\dfrac{-7}{6}\right).\left(\dfrac{-3}{19}\right)\)

\(=\dfrac{\left(-3\right).\left(-38\right).\left(-7\right).\left(-3\right)}{21.6.19}\)

\(=\dfrac{\left(-3\right).\left(-2\right).19.\left(-7\right).\left(-3\right)}{3.7.3.2.19}\)

\(=1\)

e)\(\left(\dfrac{11}{18}:\dfrac{22}{9}\right).\dfrac{8}{5}\)

\(=\left(\dfrac{11}{18}.\dfrac{9}{22}\right).\dfrac{8}{5}\)

\(=\dfrac{11.9}{18.22}.\dfrac{8}{5}\)

\(=\dfrac{11.9.2.2.2}{2.9.11.2.5}\)(có thể bỏ qua bước này)

\(=\dfrac{2}{5}\)

g)\(\left[\left(-\dfrac{4}{5}\right).\dfrac{5}{8}\right]:\left(-\dfrac{25}{12}\right)\)

\(=\left[\dfrac{\left(-4\right).5}{5.8}\right].\dfrac{-12}{25}\)

\(=\dfrac{-1}{2}.\dfrac{-12}{25}\)

\(=\dfrac{6}{25}\)

mọi người giúp mình câu p đến e với ạ