\(A=\left\{2x-3\left(x-1\right)-5\left[x-4\left(3-2x\right)+10\right]\right\}.\left(-2x\right)\)

\(=\left\{2x-3x+3-5\left[x-12+8x+10\right]\right\}.\left(-2x\right)\)

\(=\left\{-x+3-5\left(7x-2\right)\right\}.\left(-2x\right)\)

\(=\left(-x+3-35x+10\right).\left(-2x\right)\)

\(=\left(-36x+13\right).\left(-2x\right)\)

\(=72x^2-26x\)

\(\dfrac{3}{x}=\dfrac{1}{y}=\dfrac{6}{2}\)

\(\Rightarrow\dfrac{3}{x}=\dfrac{1}{y}=3\)

\(\Rightarrow\left\{{}\begin{matrix}x=1\\y=\dfrac{1}{3}\end{matrix}\right.\)

x = 1

y = 1/3

x = 1 

y = 1/3. 

\(\Rightarrow2-4x=6-3x\\ \Rightarrow x=-4\)

\(\dfrac{2x-1}{3}=\dfrac{2-x}{-2}\)

\(\Rightarrow-2\left(2x-1\right)=3\left(2-x\right)\)

\(\Rightarrow-4x+2=6-3x\Rightarrow x=-4\)

Có đúng hông dậy mọi người

4x5x6/3x10x8=120/240=120:120/240:120=1/2 nha

~HT~

k cho mình nha

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Bằng 1/2b nha k nhaaa

ĐỀ bài thiếu dữ kiện

mình chắc chắn ;lun

hong hieu thieu de bai hay sao y

(-2x-7)-(-5x+18)=35

=>-2x-7+5x-18=35

=>3x-25=35

=>3x=35+25

=>3x=60

=>x=60:3

=>x=20

(-2x-7)-(-5x+18)=35

-2x-7+5x-18=35

(-2x+5x)-(7+18)=35

3x-25=35

3x=35+25

3x=60

x=60:3

x=20

Vậy x=20

\(\left(-2x-7\right)-\left(5x+18\right)=35.\)

\(\Leftrightarrow-2x-7-5x-18=35\)

\(\Leftrightarrow-7x-25=35\)

\(\Rightarrow-7x=60\)

\(\Leftrightarrow x=-\frac{60}{7}\)

Vậy \(x=-\frac{60}{7}\)

\(3^{x+4}=9^{2x-1}\)

\(\Rightarrow3^{x+4}=3^{4x-2}\)

\(\Rightarrow x+4=4x-2\)

\(\Rightarrow3x=6\Rightarrow x=2\)

3x+4=92x−13x+4=92x−1

⇒3x+4=34x−2⇒3x+4=34x−2