=>36/18>x>8/15

=>2>x>8/15

mà x nguyên

nên x=1

no

bài 1 hình 3,10 là hình chi rx bn

1) pen 

2) book 

3)baby

4)pig

5)bee

6)ball

7)parent

8)bed

9)pizza

10)bean

11)bus

12)piano

a: \(A=\dfrac{2\cdot8^4\cdot27^2+44\cdot6^9}{2^7\cdot6^7+2^7\cdot40\cdot9^4}\)

\(=\dfrac{2\cdot2^{12}\cdot3^6+2^2\cdot11\cdot2^9\cdot3^9}{2^7\cdot3^7\cdot2^7+2^7\cdot2^3\cdot5\cdot3^8}\)

\(=\dfrac{2^{13}\cdot3^6+2^{11}\cdot3^9\cdot11}{2^{14}\cdot3^7+2^{10}\cdot5\cdot3^8}\)

\(=\dfrac{2^{11}\cdot3^6\left(2^2+3^3\cdot11\right)}{2^{10}\cdot3^7\left(2^4+5\cdot3\right)}\)

\(=\dfrac{2\cdot301}{3\cdot31}=\dfrac{602}{93}\)

b: \(=\dfrac{3a-9-2a-6-6}{\left(a+3\right)\left(a-3\right)}=\dfrac{a-15}{a^2-9}\)

a) x.  -5/3 = 1

=> x     = 1 : -5/3

=> x     = -3/5

b) x : 17/8 = (-2). -9/17

    => x : 17/8 = 18/17

    => x            = 18/17 . 17/8

    => x            = 9/4

c) x . 1/5 . 7/10 = 1

=> x . 7/50 = 1

=> x           = 1 : 7/50

=> x           = 50/7

Chúc bạn học tốt 

a) \(x=1:\frac{-5}{3}=\frac{1.-3}{5}=\frac{-3}{5}\)

b) \(x:\frac{17}{8}=-2.\frac{-9}{17}=\frac{18}{17}\)

\(x=\frac{18}{17}.\frac{17}{8}=\frac{18}{8}=\frac{9}{4}\)

c) \(x=1:\frac{7}{10}:\frac{1}{5}=1.\frac{10}{7}.5=5.\frac{10}{7}=\frac{50}{7}\)

Chúc bạn học tốt!!!

a: \(B=\dfrac{x^2+5x+5x+25}{x\left(x+5\right)}=\dfrac{x+5}{x}\)

\(x^2+4x+5=2\sqrt{2x+3}\)

\(ĐK:x\ge-\dfrac{3}{2}\)

\(pt\Leftrightarrow(2x+3-2\sqrt{2x+3}+1)+x^2+2x+1=0\)

\(\Leftrightarrow\left(\sqrt{2x+3}-1\right)^2=-\left(x+1\right)^2\)

Vì \(\left(\sqrt{2x+3}-1\right)^2\ge0;-\left(x+1\right)^2\le0\forall x\)

\(\Rightarrow\left\{{}\begin{matrix}(\sqrt{2x+3}-1)^2=0\\\left(x+1\right)^2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\sqrt{2x+3}-1=0\\x+1=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\sqrt{2x+3}=1\\x=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x+3=1\\x=-1\end{matrix}\right.\Leftrightarrow x=-1\left(tm\right)}\)

\(\Leftrightarrow x=-1\left(tm\right)\)

Vậy, pt có nghiệm duy nhất là x=-1

x/6 + x/12 + x/7 + 5 + x/2 +4 = x

=> x/6 + x/12 + x/7 + x/2 - x = -5 - 4

=> x.(1/6 + 1/12 + 1/7 + 1/2 - 1) = -9

=> x. (-3/28) = -9

=> x = 84. Vậy x = 84

con hâm giảnh rỗi quá nhỉ