a) \(X=\frac{-1}{2}+\frac{3}{4}\)
\(\Leftrightarrow X=\frac{-2}{4}+\frac{3}{4}\)
\(\Leftrightarrow X=\frac{1}{4}\)
b) \(\frac{X}{5}=\frac{5}{6}+\frac{-19}{30}\)
\(\Leftrightarrow\frac{X}{5}=\frac{25}{30}+\frac{-19}{30}\)
\(\Leftrightarrow\frac{X}{5}=\frac{6}{30}=\frac{1}{5}\)
\(\Leftrightarrow X=1\)
Đáp số: a) \(X=\frac{1}{4}\)
b) \(X=1\)
\(\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}\)
\(x=\frac{1}{2}+\frac{-2}{3}\)
\(\frac{x}{30}=\frac{3}{5}+\frac{7}{30}\)
Đề bài: Tìm x biết:
a, tính:\(\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
b, tìm x biết:\(1\frac{1}{30}:(24\frac{1}{6}-24\frac{1}{5})-\frac{1\frac{1}{2}-\frac{3}{4}}{4x-\frac{1}{2}}=(-1\frac{1}{5}):(8\frac{1}{5}-8\frac{1}{3})\)
tìm x , y biết
a, \(\frac{4}{x}+\frac{y}{3}=\frac{5}{6}\)
b, \(\frac{5}{x}-\frac{y}{3}=\frac{1}{6}\)
c, \(\frac{x}{6}-\frac{2}{y}=\frac{1}{30}\)
1 tìm x biết ;
a, 0-|x + 1| = 5
b, 2 - | \(\frac{3}{4}\)- x | = \(\frac{7}{12}\)
c, 2 | \(\frac{1}{2}\)x - \(\frac{1}{3}\)| - \(\frac{3}{2}\)= \(\frac{1}{4}\)
d, | x - \(\frac{1}{3}\)| = \(\frac{5}{6}\)
e, \(\frac{3}{4}\)- 2 | 2x - \(\frac{2}{3}\)| = 2
f, \(\frac{2x-1}{2}\)= \(\frac{5+3x}{3}\)
1 tìm x biết ;
a, 0-|x + 1| = 5
b, 2 - | \(\frac{3}{4}\)- x | = \(\frac{7}{12}\)
c, 2 | \(\frac{1}{2}\)x - \(\frac{1}{3}\)| - \(\frac{3}{2}\)= \(\frac{1}{4}\)
d, | x - \(\frac{1}{3}\)| = \(\frac{5}{6}\)
e, \(\frac{3}{4}\)- 2 | 2x - \(\frac{2}{3}\)| = 2
f, \(\frac{2x-1}{2}\)= \(\frac{5+3x}{3}\)
1 THỰC HIỆN PHÉP TÍNH
A = \(2\frac{1}{2}:0,8-2\frac{1}{2}.\left(\frac{2}{3}+\frac{1}{5}\right)\)
2 TÌM X ,Y \(\in z\), BIẾT
A )\(\frac{6}{x}=\frac{Y}{28}=\frac{-9}{21}\)
B ) \(\frac{x}{30}=\frac{5}{6}+\frac{-2}{3}.\frac{1}{5}\)
3 CHO CÁC BIỂU THỨC
A =\(\frac{4}{3}.\frac{5}{19}-\frac{7}{10}.\frac{5}{19}\)
B = \(\frac{2}{3}:5+\frac{3}{5}-\frac{8}{15}\)
a ) TÍNH A VÀ B
b) SO SÁNH A VÀ B
Tìm x, biết:
a) (x + \(\frac{1}{2}\) )2 = \(\frac{4}{25}\)
b) \(\frac{19}{24}\) x = \(\frac{5}{12}\) + (\(-5\frac{1}{6}\) )
c) (30%x + \(2\frac{1}{2}\) ) . \(\frac{3}{5}\) = \(2\frac{1}{2}\)
bài 15 tìm x biết
a\(\frac{x}{4}-\frac{3}{7}+\frac{2}{5}=\frac{31}{140}\)
b\(\frac{5}{12}+\frac{5}{x}-\frac{1}{8}=\frac{1}{2}\)
c\(x+\frac{1}{9}-\frac{3}{5}=\frac{3}{6}\)
d\(\frac{3}{4}-x+\frac{6}{-11}=\frac{5}{6}\)
e\(x-\frac{1}{9}-\frac{3}{5}=\frac{3}{6}\)
Bài 1:Thực hiện phép tính
\(a,75\%-1\frac{1}{2}+0,5:\frac{5}{12}-\left(\frac{-1}{2}\right)^2\) \(b,\left(\frac{5}{7}.0,6-5:3\frac{1}{2}\right).\left(40\%-1,4\right).\left(-2\right)^3\)
Bài 2: Tính nhanh
\(\left(\frac{-4}{5}+\frac{4}{3}\right)+\left(\frac{-5}{4}+\frac{14}{5}\right)-\frac{7}{3}\)
Bài 3:Tìm x biết
\(a,\frac{-2}{3}-\frac{1}{3}.\left(2x-5\right)=\frac{3}{2}\) \(b,\frac{2}{5}.x+\frac{1}{2}=\frac{-3}{4}\) \(\frac{1}{3}.x-8=\frac{1}{2}\) \(x-\frac{1}{4}=\frac{5}{8}.\frac{2}{3}\)
Bài 4: Tìm x biết
\(a,\left(\frac{3}{4}.x+2\frac{1}{2}\right).\frac{-2}{3}=\frac{1}{8}\) \(b,\frac{1}{3}.x-0,5=0,75\)
Bài 5: Tìm x biết
\(a,\frac{2}{5}+\frac{3}{5}.\left(3x-3,7\right)=-\frac{53}{10}\) \(b,5,2.x+7\frac{2}{5}=6\frac{3}{4}\) \(2,4:\left(\frac{-1}{2}-x\right)=1\frac{3}{5}\)
Bài 6:Tìm số tự nhiên x,biết: \(\left(x-5\right).\frac{30}{100}=\frac{20.x}{100}+5\)
Mik đang cần gấp giúp mik nha!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
