\(\left(x-1\right)7=\left(x-5\right)6\)
\(7x-7=6x-30\)
\(7x-7-6x+30=0\)
\(x+23=0\)
\(x=-23\)
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Bài 7: Tỉ lệ thức
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Tìm x, biết :
\(a.3\dfrac{4}{5}:40\dfrac{8}{15}=0,25:x\)
\(b.\left(x+1\right):\dfrac{5}{6}=20:3\)
\(c.\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
1. a) \(\dfrac{x-3}{5}=\dfrac{7}{x-1}\)
b) \(\left(x-5\right)^{x+1}-\left(x-5\right)^{x+11}=0\)
2. Cho \(\dfrac{a+5}{a-5}=\dfrac{b+6}{b-6}\)( a khác 5; b khác 6)
CMR: \(\dfrac{a}{b}=\dfrac{5}{6}\)
Tìm x trong tỉ lệ thức
a) -0,52:x-9,36:16,38
b) 2dfrac{2}{5}:x1dfrac{7}{9}:0,2
c)left(dfrac{2}{5}xright):dfrac{1}{3}1dfrac{1}{3}:dfrac{4}{5}
d) 0,3:1dfrac{1}{3}dfrac{2}{5}:left(3x+6right)
e) dfrac{x}{-15}dfrac{-60}{x}
f) dfrac{x-1}{-15}dfrac{-60}{x-1}
g) dfrac{x-1}{7}dfrac{9}{x+1}
h) dfrac{x-2}{x-1}dfrac{x+4}{x+7}
Đọc tiếp
Tìm x trong tỉ lệ thức
a) \(-0,52:x=-9,36:16,38\)
b) \(2\dfrac{2}{5}:x=1\dfrac{7}{9}:0,2\)
c)\(\left(\dfrac{2}{5}x\right):\dfrac{1}{3}=1\dfrac{1}{3}:\dfrac{4}{5}\)
d) \(0,3:1\dfrac{1}{3}=\dfrac{2}{5}:\left(3x+6\right)\)
e) \(\dfrac{x}{-15}=\dfrac{-60}{x}\)
f) \(\dfrac{x-1}{-15}=\dfrac{-60}{x-1}\)
g) \(\dfrac{x-1}{7}=\dfrac{9}{x+1}\)
h) \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
bài tìm x,y,z biết :a)\(\dfrac{x}{5}=\dfrac{y}{6};\dfrac{y}{8}=\dfrac{z}{7}\)và x+y-z=69
b)\(\dfrac{x}{3}=\dfrac{y}{4};\dfrac{y}{3}=\dfrac{z}{5}\)và 2x-3y+z=6
c)\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{z}{6}\)và x+y=14
d)\(\dfrac{2}{3x}=\dfrac{1}{2y}=\dfrac{2}{z}\)và 3x+2y+z=1
Tìm x:
1) dfrac{1,2}{30}dfrac{3x+4}{50}
2) dfrac{x-1}{x-5}dfrac{6}{7}
3) dfrac{x-1}{3}dfrac{x+3}{5}
4) dfrac{3}{7}dfrac{2x+1}{3x+5}
5) dfrac{2x+3}{3x+1}dfrac{3}{4}
6) dfrac{2x+3}{6}dfrac{7x-3}{15}
7) dfrac{6x-5}{-7}dfrac{5x-3}{-5}
8) dfrac{x+1}{x-2}dfrac{3}{4}
9) dfrac{2x-3}{x+1}dfrac{4}{7}
10) dfrac{2x+3}{7}dfrac{4x-1}{15}
11) dfrac{2x+3}{24}dfrac{3x-1}{32}
12) dfrac{2x+4}{7}dfrac{4x-2}{15}
13) dfrac{11x-2}{7x+5}dfrac{11}{8}
14) dfrac{12-7x}{-13}dfrac{4-3x}{-5}
15) dfrac{52}{2x-1...
Đọc tiếp
Tìm x:
1) \(\dfrac{1,2}{30}\)\(=\dfrac{3x+4}{50}\)
2) \(\dfrac{x-1}{x-5}\)\(=\dfrac{6}{7}\)
3) \(\dfrac{x-1}{3}\)\(=\dfrac{x+3}{5}\)
4) \(\dfrac{3}{7}\)\(=\dfrac{2x+1}{3x+5}\)
5) \(\dfrac{2x+3}{3x+1}\)\(=\dfrac{3}{4}\)
6) \(\dfrac{2x+3}{6}\)\(=\dfrac{7x-3}{15}\)
7) \(\dfrac{6x-5}{-7}\)\(=\dfrac{5x-3}{-5}\)
8) \(\dfrac{x+1}{x-2}\)\(=\dfrac{3}{4}\)
9) \(\dfrac{2x-3}{x+1}\)\(=\dfrac{4}{7}\)
10) \(\dfrac{2x+3}{7}\)\(=\dfrac{4x-1}{15}\)
11) \(\dfrac{2x+3}{24}\)\(=\dfrac{3x-1}{32}\)
12) \(\dfrac{2x+4}{7}\)\(=\dfrac{4x-2}{15}\)
13) \(\dfrac{11x-2}{7x+5}\)\(=\dfrac{11}{8}\)
14) \(\dfrac{12-7x}{-13}\)\(=\dfrac{4-3x}{-5}\)
15) \(\dfrac{52}{2x-1}\)\(=\dfrac{13}{30}\)
1) \(\dfrac{x}{\dfrac{-5}{9}}\)= \(\dfrac{\dfrac{4}{3}}{\dfrac{-2}{5}}\)
2) \(\dfrac{7}{\dfrac{5}{3x}}\)= \(\dfrac{-\dfrac{4}{9}}{\dfrac{5}{6}}\)
dạng : tỉ lệ thức
tìm x biết
a, \(\dfrac{x-2}{-1,2}=\dfrac{-5}{2}\)
b, \(\dfrac{-6}{x+1}=\dfrac{1,8}{9}\)
c, \(\dfrac{-3}{x}=\dfrac{x}{-12}\)
d, \(\dfrac{x-4}{x-1}=\dfrac{3}{5}\)
e,\(\dfrac{1,12}{-10}=\dfrac{11,2}{x}\)
8 tháng 10 2021 lúc 21:11
Tìm x:
a) \(\dfrac{x-3}{x+5}=\dfrac{5}{7}\) b) \(\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
mọi người ơi giúp mik với ai làm đc mik tick cho
3, Tìm x, biết:
a) 2,5 : 7,5 = x : \(\dfrac{3}{5}\)
b) \(2\dfrac{2}{3}\) : x = \(1\dfrac{7}{9}\)
c) \(\dfrac{5}{6}\) : x = 20 : 3