1: \(\Leftrightarrow x\cdot\dfrac{8}{x}=1\cdot\dfrac{1}{2}\)
=>8=1/2(loại)
2: =>16x=15x
=>x=0
3: =>7x+7=9x-9
=>-2x=-16
=>x=8
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Bài 7: Tỉ lệ thức
Các câu hỏi tương tự
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) \(\dfrac{52}{2x-1}\)\(=\dfrac{13}{30}\)
Tìm x, biết :
\(a.3\dfrac{4}{5}:40\dfrac{8}{15}=0,25:x\)
\(b.\left(x+1\right):\dfrac{5}{6}=20:3\)
\(c.\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
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
1,2x :dfrac{5}{7}dfrac{14}{15} : dfrac{3}{2}
2,dfrac{9}{10} :(3x) dfrac{5}{3}:dfrac{20}{27}
3,dfrac{x-2}{27}dfrac{3}{x-2}
4,dfrac{2x+5}{9-2x}dfrac{2}{5}
5,dfrac{x-7}{x+8}dfrac{x-8}{x+9}
Đọc tiếp
1,2x :\(\dfrac{5}{7}\)=\(\dfrac{14}{15}\) : \(\dfrac{3}{2}\)
2,\(\dfrac{9}{10}\) :(3x) = \(\dfrac{5}{3}:\dfrac{20}{27}\)
3,\(\dfrac{x-2}{27}=\dfrac{3}{x-2}\)
4,\(\dfrac{2x+5}{9-2x}=\dfrac{2}{5}\)
5,\(\dfrac{x-7}{x+8}=\dfrac{x-8}{x+9}\)
Tìm hai số x,y biết
a/\(\dfrac{x^3}{8}=\dfrac{y^3}{27}=\dfrac{z^3}{64};x^2+2y^2-3z^2=-650\)
b/\(\dfrac{x-1}{2}=\dfrac{y+3}{4}=\dfrac{z-5}{6};5z-3x-4y=50\)
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) \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
Tìm x,y biết: \(\dfrac{x+3}{6} = \dfrac{2x + 1 }{7} = \dfrac{2 + 3x}{y}\)
1) \(\dfrac{-5}{\dfrac{12}{\left|\dfrac{2}{3}x+\dfrac{1}{2}\right|}}\)= \(\dfrac{\dfrac{-4}{9}}{\dfrac{8}{15}}\)
2) \(\dfrac{\left|3x-5\right|}{-3}\)= \(\dfrac{\dfrac{-5}{6}}{\dfrac{4}{9}}\)
bài 1 : tì tỉ lệ thức dfrac{a}{b} dfrac{c}{d} hãy suy ra
a, dfrac{a}{a+b} dfrac{c}{c+d}
b, dfrac{a}{a-b}dfrac{c}{c-d}
bài 2 : lập tỉ lệ thức có được từ các số sau
a, 3;4; 4 và 1 phần 2 ;5;6
b, 3;4;15;20
bài 3 : tìm x biết
a, dfrac{x}{0,9}dfrac{5}{6}
b, dfrac{14}{15}: dfrac{9}{10} x:dfrac{3}{7}
c, dfrac{-6}{x} dfrac{9}{-15}
d, 1 và 3 phần 5 chia 8 2,5 : x
e, dfrac{x}{2}dfrac{8}{x}
g, dfrac{3x-7}{8}dfrac{5}{2}
Đọc tiếp
bài 1 : tì tỉ lệ thức \(\dfrac{a}{b} = \dfrac{c}{d}\) hãy suy ra
a, \(\dfrac{a}{a+b}\) = \(\dfrac{c}{c+d}\)
b, \(\dfrac{a}{a-b}=\dfrac{c}{c-d}\)
bài 2 : lập tỉ lệ thức có được từ các số sau
a, 3;4; 4 và 1 phần 2 ;5;6
b, 3;4;15;20
bài 3 : tìm x biết
a, \(\dfrac{x}{0,9}=\dfrac{5}{6}\)
b, \(\dfrac{14}{15}: \dfrac{9}{10}= x:\dfrac{3}{7}\)
c, \(\dfrac{-6}{x} = \dfrac{9}{-15}\)
d, 1 và 3 phần 5 chia 8 = 2,5 : x
e, \(\dfrac{x}{2}=\dfrac{8}{x}\)
g, \(\dfrac{3x-7}{8}=\dfrac{5}{2}\)
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,\(\dfrac{1,12}{-10}=\dfrac{11,2}{x}\)