Tìm số nguyên x biết
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-x}{4}\) = \(\frac{-9}{x}\)
c) \(\frac{-35}{7}\) < x\(\le\) -1
d) \(\frac{-30}{5}\)<x<\(\frac{-45}{9}\)
Tìm số nguyên x
a) \(\frac{1}{3}+\frac{-2}{5}+\frac{1}{6}+\frac{-1}{5}\le x< \frac{-3}{4}+\frac{2}{7}+\frac{-1}{4}+\frac{3}{5}+\frac{5}{7}\)
b)\(\frac{5}{17}+\frac{-9}{4}+\frac{-26}{31}+\frac{12}{17}+\frac{-11}{31}< \frac{x}{9}\le\frac{-3}{7}+\frac{7}{15}+\frac{4}{-7}+\frac{8}{15}\)
\(a)\frac{1}{3}+\frac{-2}{5}+\frac{1}{6}+\frac{-1}{5}\le x< \frac{-3}{4}+\frac{2}{7}+\frac{-1}{4}+\frac{3}{5}+\frac{5}{7}\)
\(\Rightarrow\frac{1}{3}+\frac{1}{6}+\frac{-2}{5}+\frac{-1}{5}\le x< \frac{-3}{4}+\frac{-1}{4}+\frac{2}{7}+\frac{5}{7}+\frac{3}{5}\)
\(\Rightarrow\frac{2}{6}+\frac{1}{6}+\frac{-3}{5}\le x< -1+1+\frac{3}{5}\)
\(\Rightarrow\frac{1}{2}+\frac{-3}{5}\le x< \frac{3}{5}\)
\(\Rightarrow\frac{-1}{10}\le x< \frac{6}{10}\)
\(\Rightarrow-1\le x< 6\)
\(\Rightarrow x\in\left\{-1;0;1;2;3;4;5\right\}\)
Bài b tương tự
bạn ơi bạn giải câu b được ko. mk ko biết làm câu b
Tìm số nguyên x biết :
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-x}{4}\) = \(\frac{-9}{x}\)
c) \(\frac{-35}{7}\) < x \(\le\) -1
d) \(\frac{-30}{5}\) < x < \(\frac{-45}{9}\)
Tìm số nguyên x biết :
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-35}{7}\)< x\(\le\) -1
c) \(\frac{-30}{5}\)<x< \(\frac{-45}{9}\)
d) \(\frac{-x}{4}\)=\(\frac{-9}{x}\)
Tìm số nguyên x biết :
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-x}{4}\) = \(\frac{-9}{x}\)
c) \(\frac{-35}{7}\) < x \(\le\) -1
d) \(\frac{-30}{5}\) < x < \(\frac{-45}{9}\)
Tìm số nguyên x biết: a) \(-4\frac{3}{5}.2\frac{4}{23}\le x\le-2\frac{3}{5}:1\frac{6}{15}\)
b) \(-4\frac{1}{3}.\left(\frac{1}{2}-\frac{1}{6}\right)\le x\le-\frac{2}{3}\left(\frac{1}{3}-\frac{1}{2}-\frac{3}{4}\right)\)
Tìm số nguyên x, biết :
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-x}{4}\) = \(\frac{-9}{x}\)
c) \(\frac{-35}{7}\) < x < -1
d) \(\frac{-30}{5}\) < x < \(\frac{-45}{9}\)
Ta có:
a) \(\Leftrightarrow3\left(x+2\right)=-4\left(x-5\right)\)
\(\Leftrightarrow3x+6=-4x+20\)
\(\Leftrightarrow7x=14\Leftrightarrow x=2\)
b)Ta có:
\(-\frac{x}{4}=-\frac{9}{x}\)
\(\Leftrightarrow-x^2=-36\)
\(\Leftrightarrow x^2=36\)
\(\Leftrightarrow x=\pm6\)
c) Ta có:
\(-\frac{35}{7}< x\le-1\)
\(\Leftrightarrow-5< x\le-1\)
Do x là số nguyên
\(\Rightarrow x\in\left\{-4,-3,-2,-1\right\}\)
Tìm số nguyên x biết :
a) \(\frac{3}{x-5}\) = \(\frac{-4}{x+2}\)
b) \(\frac{-x}{4}\) = \(\frac{-9}{x}\)
c) \(\frac{-35}{7}\)< x \(\le\) -1
d) \(\frac{-30}{5}\) < x < \(\frac{-45}{9}\)
Các bạn ơi giúp mk với!
Bài 8: Tìm số nguyên x biết
a) \(\left(\frac{-12}{27}+\frac{2}{3}\right)+\frac{-2}{9}\le x\le\left(\frac{11}{7}+\frac{2}{5}\right)+\frac{7}{5}+\frac{3}{7}\) b\(\frac{-x}{2}+\frac{2x}{3}+\frac{x+1}{4}+\frac{2x+1}{6}=\frac{8}{3}\)
c)\(\frac{3}{2x+1}+\frac{10}{4x+2}-\frac{6}{6x+3}=\frac{12}{26}\)
1. Tính:a) A=1253.24; b) B=\(\frac{1}{49^4}\).77; c) C=\(\frac{27^3+9^5}{81^3+3^{11}}\); d) D=\(\frac{\frac{4}{9}+\frac{28}{15}-\frac{12}{4}}{\frac{5}{9}+\frac{35}{15}-\frac{15}{4}}\)
2. a) Tìm GTNN của A= (2x-3)2-7; b) Tìm GTLN của 3- giá trị tuyệt đối của 3x-2
3. Tìm sốx nguyên để các số sau là số nguyên: a)A= 2+\(\frac{3}{x+1}\);b) B=\(\frac{3x-1}{x-1}\)