2x-1+5.2x-2=2.2x-2+5.2x-2=2x-2.(5+2)=2x-2.7=7/32
=>2x-2=7/32:7=1/32
=>x-2=-5
=>x=-3
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Tìm x,y,z,biết:
1)2x=3y=4z và 2x-5z=-6
2)\(\frac{x+3}{5}=\frac{y-2}{3}=\frac{z-1}{7}\) và 3x+5y-7z=32
tìm X
1)\(\left(\frac{2x}{3}-3\right):\left(-10\right)=\frac{2}{5}\)
2)\(|2x-1|+1=4\)
3)\(\left(3x-7\right)^2=36\)
4)\(2^2.8^{x-1}=32\)
5) 7(x-2) + 2x(2-x)=0
Tìm x
\(1,\left(x-1\right)^{x+3}=2^5:32\)
\(2,|8x-3|=|2x+1|\)
\(3,|2x+5|=|2-3x|\)
\(4,|x-1|=2x+1\)
\(\frac{5}{4}:\frac{x}{3}=\frac{1}{7}-\frac{-3}{7}\)
Tìm x
a) \(\frac{x+5}{40}+\frac{x+7}{38}+\frac{x+9}{36}=\frac{x+11}{34}+\frac{x+13}{32}-1\)
b) /3x - 2/ - x = 7
c) /2x - 3/ > 5
Tìm x biết :
a) \(\frac{32-x}{7}=\frac{x-42}{9}\)
b) \(\left(2x-1\right)^2+\left|x+3\right|=0\)
tìm x, biết
1. \(\frac{x+1}{x-2}=\frac{3}{4}\)
2. \(\frac{52}{2x-1}=\frac{13}{30}\)
3.\(\frac{2x-3}{x+1}=\frac{4}{7}\)
4. \(\frac{2x+3}{42}=\frac{3x-1}{32}\)
giúp mk với nha
tìm giá trị lớn nhất của biểu thức
B=\(\frac{\left|2x+7\right|+13}{2\left|2y+7\right|+6}\)
C=\(\frac{15\left|x+1\right|+32}{6\left|x+1\right|+8}\)
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 nguyên: \(2^{5\left(\frac{1}{2}\right)^{2x}< \left(\frac{1}{32}\right)^{12}}\)
Tìm x \(\frac{7^{x+2}+7^{x+1}+7^x}{57}=\frac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)