x.-28=-7.32
x.-28=-224
x=-224:-28
x=8
\(\dfrac{-7}{x}=\dfrac{-28}{32}\\ \dfrac{-28}{4x}=\dfrac{-28}{32}\\ 4x=32\\ x=8\)
\(\dfrac{-3}{7}\) x = \(\dfrac{3}{56}\).\(\dfrac{28}{9}\) Tìm x
Tìm x, biết:
a) \(\dfrac{3}{4}x\) - \(\dfrac{7}{12}\) = \(\dfrac{5}{6}\) - \(\dfrac{2}{3}\)
b) -\(\dfrac{5}{x}\) = \(\dfrac{20}{28}\)
c) \(2\dfrac{1}{3}\) : x = 7
d) \(\dfrac{-105}{12}\) < x < \(\dfrac{20}{7}\)
Tìm x:
a) \(\dfrac{-3}{7}\).x=\(\dfrac{3}{56}\).\(\dfrac{28}{9}\)
b) x-\(\dfrac{3}{16}\)=\(\dfrac{7}{15}\):\(\dfrac{3}{5}\)
c) \(\dfrac{2}{5}\)+\(\dfrac{1}{5}\).x=\(\dfrac{5}{6}\)
d) \(\dfrac{3}{4}\)x-\(\dfrac{2}{5}\)x=\(\dfrac{3}{7}\).\(\dfrac{1}{6}\)+\(\dfrac{5}{7}\).\(\dfrac{1}{6}\)
*Lưu ý: Trình bày chi tiết kết quả.
Tìm x, y ∈ Z:
a) \(\dfrac{4}{x}\)=\(\dfrac{y}{-21}\)=\(\dfrac{28}{49}\).
b) \(\dfrac{x}{7}\)=\(\dfrac{9}{y}\) , x > y.
c) \(\dfrac{x}{15}\)=\(\dfrac{3}{y}\) , x < y < 0
Tìm các số nguyên x và y, biết:
a)\(\dfrac{x}{7}=\)\(\dfrac{6}{21}\) b)\(\dfrac{-5}{y}\)= \(\dfrac{20}{28}\)
c)\(\dfrac{-4}{8}=\)\(\dfrac{-7}{y}\)
tìm x :
a, x . \(\dfrac{-5}{8}\) = \(\dfrac{15}{32}\) b, \(\dfrac{3}{10}\) : x =\(\dfrac{-9}{20}\)
c, \(\dfrac{-1}{4}\) x + \(\dfrac{4}{5}\) =\(\dfrac{3}{4}\) d, \(\dfrac{-7}{8}\) + \(\dfrac{2}{3}\) :x = \(\dfrac{3}{5}\) . \(\dfrac{-5}{12}\)
Bài3:Tìm x
a,\(\dfrac{x}{7}\)=\(\dfrac{6}{12}\) b,\(\dfrac{-5}{x}\)=\(\dfrac{20}{28}\) c,\(\dfrac{x-2}{8}\)=\(\dfrac{3}{4}\) d,\(\dfrac{x}{-5}\)=\(\dfrac{-5}{x}\)
các ban giúp mình nha, cảm ơn các bạn
Tìm x biết:
a) \(\left(3\dfrac{1}{2}+2x\right).3\dfrac{2}{3}=5\dfrac{1}{3}\)
b) \(\left(\dfrac{x}{7}+0,25\right)=\dfrac{-1}{28}\)
\(Tìm\) \(x:\)
\(d.x:4\dfrac{1}{2}=-2,5\) \(e.\left(\left(\dfrac{x}{7}+1\right):\left(-4\right)=\dfrac{-1}{28}\right)\)
