\(2x=-\dfrac{7}{8}\Leftrightarrow x=-\dfrac{7}{16}\)
Bài 4: tìm x:
a) \(\dfrac{4}{3}\) + (1,25 - x) = 2,25
b) \(\dfrac{17}{6}\) - (x - \(\dfrac{7}{6}\) ) = \(\dfrac{7}{4}\)
c) 4 - (2x + 1) = 3 - \(\dfrac{1}{3}\)
bài 15:
a) (\(\dfrac{-2}{3}\))9 : x = (\(\dfrac{-2}{3}\))
b) x : (\(\dfrac{4}{9}\))5 = (\(\dfrac{4}{9}\))4
c) (x + 4)3 = -125
d) (10 - 5x)3 = 64
e) (4x + 5)2 = 81
Bài 16:
a) 4 - \(1\dfrac{2}{5}\) - \(\dfrac{8}{3}\)
b) -0,6 - \(\dfrac{-4}{9}\) - \(\dfrac{16}{15}\)
c) \(-\dfrac{15}{4}\) . (\(\dfrac{-7}{15}\)) . (\(-2\dfrac{2}{5}\)
Gi ải gấp giúp mình ạ, mình rất cần gấp
I = \(-1,53:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)
tính giá trị của biểu thức:
\(A=-5,13:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)
\(\dfrac{0,375-0,3+\dfrac{3}{11}+\dfrac{3}{12}}{-265+0,5-\dfrac{5}{11}-\dfrac{5}{12}}\)+\(\dfrac{1,5+1-0,75}{2,5+\dfrac{5}{3}-1,25}\)
tính
\(1,25:\dfrac{15}{20}+\left(25\%-\dfrac{5}{6}\right);4\dfrac{2}{3}\)
(\(\sqrt{\dfrac{1}{4}}\) - 1,2) : 1\(\dfrac{1}{20}\) - (- \(\dfrac{5}{2}\))2 + \(\left|1,25-\dfrac{3}{4}\right|\)
Tìm số nguyên x, biết
a) \(-\dfrac{x}{2}+\dfrac{2x}{3}+\dfrac{x+1}{4}+\dfrac{2x+1}{6}=\dfrac{8}{3}\)
b) \(\dfrac{3}{2x+1}+\dfrac{10}{4x+2}-\dfrac{6}{6x+3}=\dfrac{12}{26}\)
1.vì sao các số 0,6 ; -1,25 ; \(1\dfrac{1}{3}\)là các số hữu tỉ ?
2. Tìm \(x\) : \(-\dfrac{3}{7}+x=\dfrac{1}{3}\)
Tìm x:
a) \(-\dfrac{4}{7}\) - x = \(\dfrac{3}{5}\) - 2x
b) (\(\dfrac{3}{8}\) - \(\dfrac{1}{5}\)) + (\(\dfrac{5}{8}\) - x) = \(\dfrac{1}{5}\)
