\(\frac{13}{15}-\left(1321+x\right)\cdot\frac{7}{12}=\frac{7}{10}\)

<=>\(\frac{13}{15}-\frac{9247}{12}-\frac{7}{12}x=\frac{7}{10}\)

<=>\(-\frac{7}{12}x=\frac{7}{10}-\frac{13}{15}+\frac{9247}{12}\)

<=>\(-\frac{7}{12}x=\frac{9245}{12}\)

<=>\(x=-\frac{7927}{6}\)

2/3.x + 1/4 = 7/12

2/3.x           = 7/12 - 1/4

2/3.x           = 1/3

x                 = 1/3 : 2/3

x                 = 1/2

Bài làm

\(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)

\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)

\(\frac{2}{3}x=\frac{7}{12}-\frac{3}{12}\)

\(\frac{2}{3}x=\frac{4}{12}\)

\(\frac{2}{3}x=\frac{1}{3}\)

\(x=\frac{1}{3}:\frac{2}{3}\)

\(x=\frac{1}{3}.\frac{3}{2}\)

\(x=\frac{1}{2}\)

Vậy \(x=\frac{1}{2}\)

2/3 .x + 1/4 = 7/12

2/3 .x         = 7/12 - 1/4

2/3.x          = 1/3

x                = 1/3 : 2/3

x                = 1/2

a) \(x=-\dfrac{3}{5}\times\dfrac{9}{7}=-\dfrac{27}{35}\)

b) \(x\left(0,4-\dfrac{1}{5}\right)=\dfrac{3}{4}\)

\(x=\dfrac{3}{4}:\dfrac{1}{5}=\dfrac{15}{4}\)

a, \(x=-3,5.\dfrac{9}{7}=-\dfrac{9}{2}\)

b, \(\dfrac{2}{5}x-\dfrac{1}{5}x=\dfrac{3}{4}\Leftrightarrow\dfrac{1}{5}x=\dfrac{3}{4}\Leftrightarrow x=\dfrac{3}{4}:\dfrac{1}{5}=\dfrac{15}{4}\)

x=\(\dfrac{9}{7}x-3.5\)

x=\(\dfrac{-9}{5}\)

\(\text{#ID07 - DNfil}\)

`A = -(x + 1)^2 + 5`

Ta có: `(x + 1)^2 \ge 0` `AA` `x`

`=> -(x + 1)^2 \le 0` `AA` `x`

`=> -(x + 1)^2 + 5 \le 5` `AA` `x`

Vậy, GTLN của A là `5` khi `(x + 1)^2 = 0 => x + 1 = 0 => x = -1`

________

2.

`2x - 0,7 = 1,3`

`=> 2x = 1,3 + 0,7`

`=> 2x = 2`

`=> x = 1`

Vậy, `x = 1`

__

`x - \sqrt{25} = (2/5 - 6/5)`

`=> x - \sqrt{25} = -3/5`

`=> x = -3/5 + \sqrt{25}`

`=> x = -3/5 + 5`

`=> x = 22/5`

Vậy, `x = 22/5`

__

`3/4 + 1/4 \div x = 2/5`

`=> 1/4 \div x = 2/5 - 3/4`

`=> 1/4 \div x = -7/20`

`=> x = 1/4 \div (-7/20)`

`=> x = -5/7`

Vậy, `x = -5/7.`

x={-599}

Ta có ; 1 + (-3) + 5 + (-7) + ...... + x = -600

<=> -2 + -2 + ...... + -2 + x = -600

Mà trc x là thui nói lun x = 1199

Áp dụng tính chất dãy tỉ số bằng nhau ta có :

\(\frac{x}{5}=\frac{y}{7}=\frac{z}{3}\Leftrightarrow\frac{x^2}{5^2}=\frac{y^2}{7^2}=\frac{z^2}{3^2}=\frac{x^2+y^2-z^2}{25+49-9}=\frac{358}{65}\)

\(\hept{\begin{cases}\frac{x^2}{25}=\frac{358}{65}\\\frac{y^2}{49}=\frac{358}{65}\\\frac{z^2}{9}=\frac{358}{65}\end{cases}}\Rightarrow\hept{\begin{cases}x^2=\frac{1790}{13}\\y^2=\frac{17542}{65}\\z^2=\frac{3222}{65}\end{cases}}\Rightarrow\hept{\begin{cases}x=\sqrt{\frac{1790}{13}}\\y=\sqrt{\frac{17542}{65}}\\z=\sqrt{\frac{3222}{65}}\end{cases}}\)

Vậy ...

có đúng ko bn

\(\frac{12}{7}\times\frac{2}{11}+\frac{12}{11}\times\frac{15}{7}-\frac{12}{7}\times\frac{6}{11}\)

\(=\frac{12}{7}\times\frac{2}{11}+\frac{12}{7}\times\frac{15}{11}-\frac{12}{7}\times\frac{6}{11}\)

\(=\frac{12}{7}\times\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)

\(=\frac{12}{7}\times1=\frac{12}{7}\)

\(\frac{12}{7}.\frac{2}{11}+\frac{12}{11}.\frac{15}{7}-\frac{12}{7}.\frac{6}{11}\)

= \(\frac{24}{77}\)+\(\frac{180}{77}\)-\(\frac{72}{77}\)

=\(\frac{132}{77}\)

\(\frac{12}{7}\cdot\frac{2}{11}+\frac{12}{11}\cdot\frac{15}{7}-\frac{12}{7}\cdot\frac{6}{11}\)

\(=\frac{12}{7}\cdot\frac{2}{11}+\frac{12}{7}\cdot\frac{15}{11}-\frac{12}{7}\cdot\frac{6}{11}\)

\(=\frac{12}{7}\cdot\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)

\(=\frac{12}{7}\cdot1\)

\(=\frac{12}{7}\)