\(3^{x+1}-3^{x-2}-3^x=2\frac{8}{9}\)
=>\(3^{x-2}\left(3^3-1-3^2\right)=\frac{26}{9}\)
=>\(3^{x-2}.17=\frac{26}{9}\)
=>\(3^{x-2}=\frac{26}{9}:17\)
=>\(3^{x-2}=\frac{26}{153}\)
ơ đề sao sao ế nhể?
Tìm các số x1,x2,x3,x4,......x8,x9 biết:
a)\(\frac{x_1+1}{9}=\frac{x_2+2}{8}=\frac{x_3+3}{7}=.....=\frac{x_8+8}{2}=\frac{x_9+9}{1}\)và x1 +x2+...+x8+x9=90
b) \(\frac{x_1-1}{9}=\frac{x_2-2}{8}=\frac{x_3-3}{7}=...=\frac{x_8-8}{2}=\frac{x_9-9}{1}\)và và x1 +x2+...+x8+x9=900
(giải chi tiết hộ mình nha)
Tìm số nguyên x, nếu biết:
1)\(4.3^{x-1}+2.3^{x+2}=4.3^6+2.3^9\)
2)\(\frac{5}{3}.8^{x+2}-\frac{3}{5}.8^x=\frac{5}{3}.8^{11}-\frac{3}{5}.8^9\)
3)\(\left(\frac{1}{3}+\frac{1}{6}\right).2^{x+4}-2^x=2^{13}-2^{10}\)
Mấy bn giúp mk nha!!! lm câu nào cg đc hết á, cảm ơn nha!!!!!
:D
Tìm x biết
a) x+2x+3x+4x+...+100x=-213
b)\(\frac{1}{2}x-\frac{1}{3}=\frac{1}{4}x-\frac{1}{6}\)
c)3(x-2)+2(x-1)=10
d)\(\frac{x+1}{3}=\frac{x-2}{4}\)
e)\(\frac{x-6}{7}+\frac{x-7}{8}+\frac{x-8}{9}=\frac{x-9}{10}+\frac{x-10}{11}+\frac{x-11}{12}\)
f)\(\frac{x+32}{11}+\frac{x+23}{12}=\frac{x+38}{13}+\frac{x+27}{14}\)
Tìm x biết
a) (8-5x).(x+2)+4.(x-2).(x+1)+2.(x-2).(x+2)=0
b)\(\left(-\frac{2}{5}+x\right):\frac{7}{9}+\left(-\frac{3}{5}+\frac{5}{6}\right):\frac{7}{9}=0\)
c)\(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\left(x+1\right)}=1\frac{2003}{2004}\)
Tìm x sao cho:\(\frac{x-1}{9}+\frac{x-2}{8}+\frac{x-3}{7}=\frac{x-4}{6}\)
tìm x :
\(\frac{5}{8}.8^{x+2}-\frac{3}{5}.8^x=\frac{5}{3}.8^{11}-\frac{3}{5}.8^9\)
tìm x
|x+1|+|x-1|=2x-3
tìm x,y,z
\(\left|xy+\frac{2}{3}\right|+\left|yz-\frac{8}{9}\right|+\left|zx+\frac{3}{4}\right|=0\)
Tìm GTNN ( tìm min) của
1.A=3./x/ -2
2.B=/x-8/ + \(\frac{3}{4}\)
3.(x-6)^10 +/x-y/+9
Tìm x biết: \(\frac{x+1}{9}+\frac{x+4}{6}+\frac{x+5}{5}=\frac{x+2}{8}+\frac{x+3}{7}+\frac{x+6}{4}.\)
