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a)2/9-(-4/9)=6/9=2/3
b)(-1/24+0,25+1 1/12):(-1/2)2
=(-1/24+6/24+26/24):(-1/2).2
=31/24.-2.2
=-31/12.2
=-31/6
c)3/13.(-5/9)+10/13.(-5/9)+(-4/9)
=-5/9(3/13+10/13)+(-4/9)
=-5/9.1+(-4/9)
=-1
Ta có:
\(\dfrac{2x+1}{x-1}=\dfrac{2x-2+3}{x-1}=\dfrac{2\left(x-1\right)+3}{x-1}=2+\dfrac{3}{x-1}\)
Để \(2x+1\) chia hết cho x-1 thì:
\(x-1\in U\left(3\right)=\left\{1;-1;3;-3\right\}\)
Ta có bảng:
\(x-1\) | 1 | -1 | 3 | -3 |
x | 2 | 0 | 4 | -2 |
Vậy: \(x\in\left\{0;2;-2;4\right\}\)
- \(x\cdot2\frac{4}{9}=4\frac{2}{5}-1\frac{4}{7}\)
\(x\cdot\frac{22}{9}=\frac{22}{5}-\frac{11}{7}\)
\(x\cdot\frac{22}{9}=\frac{99}{35}\)
\(x=\frac{99}{35}:\frac{22}{9}\)
\(x=\frac{81}{70}\)
Vậy \(x=\frac{81}{70}\).
- \(x:10\frac{6}{5}=4\frac{6}{5}+9\frac{7}{5}\)
\(x:\frac{56}{5}=\frac{26}{5}+\frac{52}{5}\)
\(x:\frac{56}{5}=\frac{78}{5}\)
\(x=\frac{78}{5}\cdot\frac{56}{5}\)
\(x=\frac{4368}{25}\)
Vậy \(x=\frac{4368}{25}\).
- \(x:3\frac{10}{3}=9\frac{1}{9}-5\frac{1}{9}\)
\(x:\frac{19}{3}=4\)
\(x=4\cdot\frac{19}{3}\)
\(x=\frac{76}{3}\)
Vậy \(x=\frac{76}{3}\).
9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 9 x 1 x 1 x 5 x 8 x 5 x 4 x 0 x 2 x 4 x 3 x 6 = 0
Blink chính hãng nhé!
_Học_tốt_
a: \(x-\dfrac{1}{24}=-\dfrac{1}{8}+\dfrac{5}{6}\)
=>\(x-\dfrac{1}{24}=\dfrac{-3}{24}+\dfrac{20}{24}=\dfrac{17}{24}\)
=>\(x=\dfrac{17}{24}+\dfrac{1}{24}=\dfrac{18}{24}=\dfrac{3}{4}\)
b: \(\dfrac{5}{8}-x=\dfrac{1}{9}-\left(-\dfrac{5}{4}\right)\)
=>\(\dfrac{5}{8}-x=\dfrac{1}{9}+\dfrac{5}{4}=\dfrac{4+45}{36}=\dfrac{49}{36}\)
=>\(x=\dfrac{5}{8}-\dfrac{49}{36}=\dfrac{45}{72}-\dfrac{98}{72}=\dfrac{-53}{72}\)
c: \(\dfrac{5}{9}+\dfrac{x}{-1}=-\dfrac{1}{3}\)
=>\(\dfrac{5}{9}-x=-\dfrac{1}{3}\)
=>\(x=\dfrac{5}{9}+\dfrac{1}{3}=\dfrac{8}{9}\)
\(\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{10}\right)\) . x = \(\dfrac{1}{9}+\dfrac{2}{8}+\dfrac{3}{7}+...+\dfrac{9}{1}\)
Biến đổi vế phải
\(\dfrac{1}{9}+\dfrac{2}{8}+\dfrac{3}{7}+...+\dfrac{9}{1}\)
= \(\left(\dfrac{1}{9}+1\right)+\left(\dfrac{2}{8}+1\right)+\left(\dfrac{3}{7}+1\right)+...+\left(\dfrac{8}{2}+1\right)+1\)
= \(\dfrac{10}{10}+\dfrac{10}{9}+\dfrac{10}{8}+\dfrac{10}{7}+...+\dfrac{10}{2}\)
= \(10\left(\dfrac{1}{10}+\dfrac{1}{9}+\dfrac{1}{8}+...+\dfrac{1}{2}\right)\)
⇒ x = 10
a: =91/105+60/105-101/105
=50/105=10/21
c: \(\dfrac{3}{4}\cdot\dfrac{5}{2}\cdot\dfrac{7}{6}=\dfrac{3}{6}\cdot\dfrac{7}{2}\cdot\dfrac{5}{4}=\dfrac{1}{2}\cdot\dfrac{7}{2}\cdot\dfrac{5}{4}=\dfrac{35}{16}\)
d: =2-2/9
=18/9-2/9
=16/9
e: =24/36-9/36+8/36
=23/36
g: =5/2+1/2
=3
\(1+1+1+1=1\cdot4=4\)
\(9\cdot9\cdot9\cdot9=9^4=6561\)
9*9*9*9=9^4=6561