\(a,\dfrac{x}{4}=\dfrac{16}{128}\\ \Leftrightarrow128x=4.16\\ \Leftrightarrow128x=64\\ \Leftrightarrow x=\dfrac{1}{2}\)
Vậy...
\(b,1\dfrac{5}{6}=\dfrac{-x}{5}\\ \Leftrightarrow-6x=25\\ \Leftrightarrow x=-\dfrac{25}{6}\)
Vậy...
\(c,4,25:8=-3,5:x\\ \Leftrightarrow4,25x=-3,5.8\\ \Leftrightarrow x=-28:4,25\\ \Leftrightarrow x=-\dfrac{112}{17}\)
Vậy...
2. Tìm x, biết:
a/ \(\dfrac{x}{4}=\dfrac{16}{128}\) ; b/\(1\dfrac{5}{6}=\dfrac{-x}{5}\) ; c/ 4,25:8= -3,5 : x
Tìm x biết:
a) \(\dfrac{x}{4}=\dfrac{16}{128}\)
b) \(1\dfrac{5}{6}=\dfrac{-x}{5}\)
c) 4,25:8=-3,5:x
Tìm x, biết:
a) \(\dfrac{x}{4}=\dfrac{16}{128}\)
b) \(1\dfrac{5}{6}=\dfrac{-x}{5}\)
c) \(4,25:8=-3,5:x\)
Tìm x
a) \(\dfrac{x}{4}=\dfrac{16}{128}\)
b)\(1\dfrac{5}{6}=\dfrac{-x}{5}\)
c) 4,25: 8 = -3,5 : x
1. Tìm x, biết :
a, \(1\dfrac{5}{6}\) = \(\dfrac{-x}{5}\) b, 4,25 : 8 = -3,5 : x
2. Lập tất cả các tỉ lệ thức có được từ tỉ lệ thức sau :
\(\dfrac{-12}{1,6}\) = \(\dfrac{55}{-7\dfrac{1}{3}}\)
Tìm x, biết :
\(a.3\dfrac{4}{5}:40\dfrac{8}{15}=0,25:x\)
\(b.\left(x+1\right):\dfrac{5}{6}=20:3\)
\(c.\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
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,\(\dfrac{1,12}{-10}=\dfrac{11,2}{x}\)
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
a) \(\dfrac{1,2}{x+3}=\dfrac{5}{4}\)
b) \(\dfrac{3}{5}:\dfrac{2x}{15}=\dfrac{1}{2}:\dfrac{4}{5}\)
c) \(\dfrac{-4}{2,5}:3,5=1,5:x\)
d)\(0,12:3=2x:\dfrac{3}{5}\)
