1: Tính : \(\dfrac{\left(\dfrac{2}{5}\right)^7.5^7+\left(\dfrac{9}{4}\right)^3:\left(\dfrac{3}{16}\right)^3}{2^7.5^2+512}\) 2 . Tìm x biết :\(\left(5.x+1\right)^2=\dfrac{36}{49}\)
15. Tính:
a) \(\frac{3^6.45^4-15^{13}.5^{-9}}{27^4.25^3+45^6}\)
b) \(\frac{\left(\frac{2}{7}\right)^7.5^7+\left(\frac{9}{4}\right)^3:\left(\frac{3}{16}\right)^3}{2^7.5^2+512}\)
mình cần lắm ạ, tối nay phải nộp rồi cám ơn các bn trc :''(
tìm x,y biết
\(x+\left(-\frac{31}{12}\right)^2=\left(\frac{49}{12}\right)^2-x=y^2\)
1/Tính
a)
\(\frac{2}{5}+\frac{1}{5}\times\left(\frac{3}{4}\right)\)
b)\(\frac{5}{12}\times\left(\frac{-3}{4}\right)+\frac{7}{12}\times\left(\frac{-3}{4}\right)\)
c)\(\frac{2^{15}\times9^4}{6^6\times8^3}\)
2/Tìm x biết:
a)\(\frac{5}{7}+\frac{2}{7}x=1\)
b)0,2+\(\left|x-1,3=1,5\right|\)
c)\(2^x+5=37\)
d)\(2^x+2^{x+1}=48\)
1 Tìm x biết :
a) \(\left(5x+1\right)^2\) = \(\dfrac{36}{49}\)
b) \(\left(x-\dfrac{2}{9}\right)^3\) = \(\left(\dfrac{2}{3}\right)^6\)
c) \(\left(8x-1\right)^{2n+1}\) = \(5^{2n+1}\) \(\left(n\in N\right)\)
tim x
a, \(\left(3x-2\right)^2=16\)
b, \(\left(\dfrac{4}{5}x-\dfrac{3}{4}\right)^3=\dfrac{-8}{125}\)
c, \(5^{x+2}+5^x=3250\)
d, \(\left(4x-3\right)^4=\left(4x-3\right)^2\)
giup minh nhe minh dang can gap
\(\left(2x+3\right)^2=\frac{9}{121}\\ \left(3x-1\right)^3=-\frac{8}{27}\)
so sanh
a,\(2^{63}va3^{42}\)
b, \(5^{400}va25^{200}\)
c, \(\left(\dfrac{-1}{16}\right)^{100}va\left(\dfrac{-1}{2}\right)^{500}\)
giup minh nhe minh dang can gap
\(\frac{\left(-7\right)^n}{\left(-7\right)^{n-1}}\) (n\(\ge\)1)