x=7/2

x=7/2

\(a,\frac{34}{5}:\frac{8}{5}=0,25:x\)

\(\frac{17}{4}=\frac{1}{4}:x\)

\(x=\frac{1}{4}:\frac{17}{4}\)

\(x=\frac{1}{17}\)

\(b,2x+\frac{3}{24}=3x-\frac{1}{32}\)

\(2x-3x=\frac{-1}{32}-\frac{1}{8}\)

\(-x=\frac{-5}{32}\)

\(x=\frac{5}{32}\)

\(13x-\frac{2}{2}x+5=\frac{76}{17}\)

\(12x=\frac{-9}{17}\)

\(x=\frac{-3}{68}\)

a,\(\frac{34}{5}\div\frac{8}{5}=0,25\div x\)

\(\frac{17}{4}=0,25\div x\)

\(x=17\)

b,\(2x+\frac{3}{24}=3x-\frac{1}{32}\)

\(\Leftrightarrow2x-3x=-\frac{1}{32}-\frac{3}{24}\)

\(\Leftrightarrow2x-3x=-\frac{5}{32}\)

\(\Leftrightarrow-x=-\frac{5}{32}\)

\(\Leftrightarrow x=\frac{5}{32}\)

\(\sqrt{x}+1=40\Rightarrow\sqrt{x}=39\Rightarrow\left(\sqrt{x}\right)^2=39^2\Rightarrow x=1521\)

\(3\sqrt{x}+1=40\)

ĐK : x ≥ 0

<=> \(3\sqrt{x}=39\)

<=> \(\sqrt{x}=13\)

<=> \(x=169\)( tm )

Vậy x = 169

a) Ta có \(\left|x-4\right|\ge0\forall x\Rightarrow A=7+\left|x-4\right|\ge7\forall x\)

Dấu "=" xảy ra <=> x - 4 = 0

=> x = 4

Vậy Min A = 7 <=> x = 4

b) Ta có : \(\left|2-3x\right|\ge0\forall x\Rightarrow B=\left|2-3x\right|-\frac{1}{5}\ge-\frac{1}{5}\forall x\)

Dấu "=" xảy ra <=> 2 - 3x = 0

=> 3x = 2

=> x = 2/3

Vậy Min B = -1/5 <=> x = 2/3

c) Ta có \(\left|\frac{1}{2}-5x\right|\ge0\forall x\Rightarrow C=7-\left|\frac{1}{2}-5x\right|\le7\forall x\)

Dấu "=" xảy ra <=> 1/2 - 5x = 0

=> x = 1/10 

Vậy Max C = 7 <=> x = 1/10

1, We find playing table tennis very unteresting because we can meet and firends with interesting people .

2, My brother and I have the same hobby 

3, I love playing outboors in my garden to plant flowers and vegetables

4, My father s rides his bike in the park at the weekend

5,Tom and peter water acctivities and they go swimming , play water polo and sury tegether a lot 

6, My hobby is collepling books because I love reading whenever I have time

7,Why don t you go jogging beacause it can help you keep fit ?

1, We ......find..........playing table tennis very unteresting because we can meet and firends with interesting people .

2, My brother and I .......have.........the same hobby 

3, I love ....playing...........outboors in my garden to plant flowers and vegetables

4, My father s ....riding...............his bike in the park at the weekend

5,Tom and peter water .......activitives............and they go swimming , play water polo and sury tegether a lot 

6, My hobby is collepling ......comic..book.............because I love reading whenever I have time

7,Why don t you .......go.......jogging beacause it can help you keep fit ?

Ta có: \(\frac{a}{b+c}=\frac{b}{a+c}=\frac{c}{a+b}\)

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

\(\frac{a}{b+c}=\frac{b}{a+c}=\frac{c}{a+b}=\frac{a+b+c}{b+c+a+c+a+b}=\frac{a+b+c}{2\left(a+b+c\right)}=\frac{1}{2}\)

Suy ra:

 \(\frac{a}{b+c}=\frac{1}{2}\Rightarrow a=\frac{b+c}{2}=\frac{1}{2}\times\left(b+c\right)\)

\(\frac{b}{a+c}=\frac{1}{2}\Rightarrow b=\frac{a+c}{2}=\frac{1}{2}\times\left(a+c\right)\)

\(\frac{c}{a+b}=\frac{1}{2}\Rightarrow c=\frac{a+b}{2}=\frac{1}{2}\times\left(a+b\right)\)

Thay  \(a=\frac{1}{2}\times\left(b+c\right)\);  \(b=\frac{1}{2}\times\left(a+c\right)\); \(c=\frac{1}{2}\times\left(a+b\right)\) vào P ta được:

\(\frac{b+c}{\frac{1}{2}\times\left(b+c\right)}+\frac{c+a}{\frac{1}{2}\times\left(a+c\right)}+\frac{a+b}{\frac{1}{2}\times\left(a+b\right)}\)

\(=\frac{\text{ }1\text{ }}{\frac{1}{2}}+\frac{1}{\frac{1}{2}}+\frac{1}{\frac{1}{2}}\)

\(=2+2+2=6\)

Vậy giá trị của P  là 6