a. \(\frac{4x+3}{9}=\frac{4}{3}\)
<=> 3 ( 4x + 3 ) = 9 . 4
<=> 12x + 9 = 36
<=> 12x = 27
<=> x =\(\frac{9}{4}\)
b. \(\frac{32-x}{3}=\frac{x-18}{5}\)
<=> 5 ( 32 - x ) = 3 ( x - 18 )
<=> 160 - 5x = 3x - 54
<=> - 5x - 3x = - 160 - 54
<=> - 8x = - 214
<=> x =\(\frac{107}{4}\)
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,\( |2-\frac{3}{2}x|-4=x+2\)
b,\(\left(4x-1\right)^{30}=\left(4x-1\right)^{20}\)
c,\(2.3^x-405=3^{x-1}\)
d.\(\left(\frac{1}{81}\right)^x.27^{2.x}=\left(-9\right)^4\)
e,\(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+5}{61}+\frac{x+7}{59}\)
g,\(\left(\frac{1}{2}\right)^{3x-1}=\frac{1}{32}\)
h,\(|3x-5|=|\frac{1}{2}x+3|\)
i,\(\left(\frac{3}{4}-x\right)^3=\frac{1}{64}\)
1.Tìm x, biết:(help me)
a)\(|x-1|—\left(-2\right)^3=9\times\left(-1\right)^{100}\)
b)\(\frac{x-2}{-4}\)=\(\frac{-9}{x-2}\)
c)\(\frac{x-5}{3}=\frac{-12}{5-x}\)
d)\(8x-|4x+\frac{3}{4}|=x+2\)
e) anh \(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x.\left(x+1\right)}=\frac{2019}{2020}\)
Tìm x , y , z biết :
a/ \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)và x + y + x = 18
b/ \(\frac{x}{5}=\frac{y}{-6}=\frac{z}{7}\)và x + y - z = 32
c/ \(\frac{x}{5}=\frac{y}{2}=\frac{z}{3}\)và 2x - 3y + 5z = 38
Tìm các số x, y biết
a, \(\frac{x}{3}=\frac{y}{4}\)và x + y = -21
b, \(\frac{x}{3}=\frac{y}{5}\)và x + y = -32
c, 5x = 7y và y - x =18
ĐANG CẦN GẤP
Tìm x;y;z
a} \(\frac{x}{4}=\frac{y}{3}=\frac{z}{9}\) và x - 3y + 4z = 62
b} 5x = 8y = 20z và x - y - z = 3
c} \(\frac{6}{11}x=\frac{9}{2}y=\frac{18}{5}z\) và -x + y + z = -120
B1.Tìm x
a) \(-x-\frac{3}{5}=\frac{7}{3}\)
b) \(\frac{4}{9}-x=\frac{-5}{3}\)
c) \(\frac{-9}{5}-\frac{6}{7}.x=\frac{2}{3}\)
d) \(\frac{3}{5}-\left(x-\frac{3}{5}\right)=\frac{4}{8}\)
e) \(\frac{-3}{8}-\left(\frac{4}{9}-x\right)=\frac{-2}{3}\)
Tìm x \(\in\)Z, biết:
a) \(\frac{1}{2}-\)\(\left(\frac{1}{3}+\frac{1}{4}\right)< x< \frac{1}{48}-\left(\frac{1}{16}-\frac{1}{6}\right)\)
b) \(4\frac{5}{9}:2\frac{5}{18}-7\le x< \frac{-2}{3}\cdot\left(\frac{1}{3}-\frac{1}{2}-\frac{3}{4}\right)\)
Tìm x,y,z biết:
a,\(\frac{x}{2,5}=\frac{y}{4}=\frac{z}{1,6}\) và 4x-8y+5z=-56
b,\(\frac{x}{10}=\frac{y}{6}=\frac{z}{3}\) và 15x-(8y+5z)=435
c,\(\frac{x}{5}=\frac{y}{-7};\frac{y}{4}=\frac{z}{15}\) và x+3y-4z=18
