a) Ta có: \(\left(8+\frac{1}{2}\right)^3:\left(1+\frac{1}{2}\right)^2\)
\(=\left(\frac{17}{2}\right)^3:\left(\frac{3}{2}\right)^2\)
\(=\frac{17^3}{8}\cdot\frac{2^2}{3}\)
\(=\frac{17^3}{2\cdot3}=\frac{4913}{6}\)
b) Ta có: \(\left(4^4-8^3\right):2^7\)
\(=\frac{2^8-2^9}{2^7}\)
\(=\frac{2^8\left(1-2\right)}{2^7}\)
\(=-2\)
Bài 1:
a) Tính giá trị của biểu thức: \(\frac{\frac{1}{3}-\frac{1}{7}+\frac{1}{11}}{\frac{2}{3}+\frac{2}{11}-\frac{2}{7}}-\frac{\frac{1}{5}-\frac{1}{3}-\frac{1}{11}}{\frac{2}{3}+\frac{2}{11}-\frac{2}{5}}\)
b) Với n là số nguyên dương, hãy xác định chữ số tận cùng của giá trị biểu thức: \(3^{n+2}+3^n-2^{n+2}-2^n\)
giúp mik với mik đag cần gấp
\(\frac{7-x}{2}-\frac{2x-3}{4}-\frac{x+2}{8}=\frac{-1}{2}\)
GIÚP MIK VS!!! MIK ĐAG CẦN GẤP.
tìm x biết
a) \(\frac{x-1}{x+2}=\frac{4}{5}\left(x\ne-2\right)\) b)22x+1+4x+3=264 c)\(\frac{x^2}{-8}=\frac{27}{x}\left(x\ne0\right)\) d)\(\frac{x+7}{-20}=\frac{-5}{x+7}\left(x\ne-7\right)\) e)\(\frac{x}{-8}=\frac{2}{-x^3}\left(x\ne0\right)\)
\(\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right).230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{7}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
1- \(\frac{2}{3}-\frac{2}{9}-\frac{2}{27}-\frac{2}{81}-\frac{2}{243}\)
TÌM x∈Q BIẾT :
a,(x-\(\frac{1}{2}\))=0
b,(x-2)2=1
c,(x-2)3=-8
d,(x+\(\frac{1}{2}\))2=\(\frac{1}{16}\)
e,(3x+1)3=-27
a,\(\frac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}\)
b,\(\frac{27^2.8^5}{6^6.32^3}+\frac{3^4.4^4}{2^2.6^2}\)
c,\(\left(1+\frac{1}{1.3}\right)\)\(\left(1+\frac{1}{2.4}\right)\)\(\left(1+\frac{1}{3.5}\right)\)........\(\left(1+\frac{1}{20.22}\right)\)
d,\(\frac{3}{2}\)+\(\frac{7}{6}\)+\(\frac{13}{12}+\frac{21}{20}+.....+\frac{91}{90}\)
e,\(\left(-2^2\right)+\sqrt{36}-\sqrt{9}+\sqrt{25}\) 20).20)
a,\(\frac{15}{34}\)+\(\frac{7}{21}\)+\(\frac{19}{34}\)-\(\frac{19}{35}1\)+\(\frac{2}{3}\)
b,(2,5)\(^3\).(-2)\(^3\)+2496\(^5\):(-832)\(^5\)-98\(^{17}\):(98)\(^{16}\)
c,\(\frac{3}{4}\).\(\frac{1}{5}26\)-\(\frac{3}{4}\).\(\frac{1}{5}44\)
d,(-2)\(^3\).(\(\frac{3}{4}\)-0,25):(\(\frac{1}{4}2\)-\(\frac{1}{6}1\))
e,\(\frac{1}{7}\).\(\frac{-3}{8}\)+\(\frac{-13}{8}\).\(\frac{1}{7}\)
f,9.(\(\frac{1}{3}\))\(^3\):[(\(\frac{-2}{3}\))\(^2\)+0,5-\(\frac{1}{2}1\)]
Bài 1: Tìm x:
a, \(\left(2-3x\right)-\left(5x+8\right)=15x\)
b, \(3\left(x-3\right)-2\left(8-x\right)=6\)
c, \(\frac{7-x}{2}-\frac{2x-3}{4}=\frac{x+2}{8}=\frac{-1}{2}\)
d, \(x^2.\left(-4x\right)+3=0\)
GIÚP MIK NHA!!!!!
