\(\Rightarrow x.\left(0,5-\frac{2}{3}\right)=\frac{7}{12}\)
\(\Rightarrow x.\left(-\frac{1}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x=\frac{7}{12}:\left(-\frac{1}{6}\right)=-\frac{7}{2}\)
a/ \(\frac{-15}{12}x+\frac{3}{7}=\frac{6}{5}x-\frac{1}{2}\)
b/\(\frac{12+x}{7}=\frac{x-4}{3}\)
Tìm x:
a)-23+0,5x=1,5
b)\(\frac{\left(-3\right)^x}{81}=-27\)
c)\(1\frac{1}{2}.x-4=0,5\)
d)\(1\frac{2}{3}:\frac{x}{4}=6:0,3\)
1. Tính hợp lí :
a) \(\frac{3}{4}-0,25-\left[\frac{7}{3}+\left(\frac{-9}{2}\right)\right]-\frac{5}{6}\)
b) 7 + \(\left(\frac{7}{12}-\frac{1}{2}+3\right)-\left(\frac{1}{12}+5\right)\)
2. Tìm các sô nguyên x biết:
\(\frac{3}{4}-\frac{5}{6}\le\frac{x}{12}< 1-\left(\frac{2}{3}-\frac{1}{4}\right)\)
Tìm số nguyễn x biết rằng: \(\frac{3}{7}.\frac{46}{3}+\frac{3}{7}.\frac{27}{5}\le x\le\left(\frac{7}{2}:7-\frac{13}{12}\right).\left(\frac{-7}{3}\right)\)
Tìm x, biết:
\(\frac{6}{x^2+2}+\frac{12}{x^2+8}=3-\frac{7}{x^2+3}\)
x: (-5/14) \(+3\frac{1}{2}=-1\frac{2}{3}\)
\(3\frac{1}{4}x-\frac{7}{6}x=\frac{-5}{12}+1\frac{2}{3}\)
Tìm x , y , z biết :
a ) \(\frac{x}{y}=-2\) và x + y = 12
b ) \(\frac{x}{y}=\frac{7}{10}\) và x y = 36
c ) \(\frac{2x}{3y}=\frac{-1}{3}\) và - 2x + 3y = 7
Tính :
\(B=\frac{7}{4}\left(\frac{33}{12}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)
\(C=\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right).230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{7}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
Tìm x
a) x + 30 % . x = -1,1
b) \(\left(x-\frac{1}{2}\right):\frac{1}{3}+\frac{5}{7}=9\frac{5}{7}\)
c) \(\frac{-5}{6}-x=\frac{7}{12}+\frac{-1}{3}\)
d) \(\frac{x+3}{-15}=\frac{1}{3}\)
e) ( 4,5 - 2x) . \(\left(-1\frac{4}{7}\right)=\frac{11}{14}\)
GIÚP MK VS , MK ĐANG CẦN RẤT GẤP!
