Question

\(\frac{x+1}{60}=\frac{\left(-15\right)}{x+1}\)

Answer 1

\(\frac{x+1}{60}=\frac{\left(-15\right)}{x+1}\)

\(\Rightarrow\left(x+1\right).\left(x+1\right)=\left(-15\right).60\)

\(\Rightarrow\left(x+1\right).\left(x+1\right)=-900\)

\(\Rightarrow\left(x+1\right)^2=-900\)

\(\Rightarrow\left(x+1\right)^2=\left(-300\right).300\)

\(\Rightarrow\left(x+1\right)^2=300^2\)

\(\Rightarrow\orbr{\begin{cases}x+1=300\\x+1=-300\end{cases}\Rightarrow\orbr{\begin{cases}x=299\\x=-301\end{cases}}}\)

Answer 2

Ta co :

\(\frac{x+1}{\text{6}0}=\frac{-1\text{5}}{x+1}\)

Suy ra

(x+1).2=-15.60

2x+2=-900

2x=-900+2

2x=-898

x=-898:2

x=-449

Answer 3

x = -449

Answer 4

à x= -301 hay sao đấy

Answer 5

mình chưa rõ

Answer 6

ê mấy bn lm kiểu zề vậy 

\(x+1.x+1=x+1.2\)á SAI HOÀN TOÀN 

\(x+1.x+1=x+1^2\)vì \(x+1^2=x+1.x+1\)

hc tốt

Answer 7

\(\frac{x+1}{60}=\frac{-15}{x+1}\)

\(\Rightarrow\left(x+1\right)^2=60.\left(-15\right)\)

\(\Leftrightarrow\left(x+1\right)^2=-900\)

\(\Leftrightarrow\left(x+1\right)^2=-30^2\)

\(\Rightarrow x+1=-30\)

\(\Leftrightarrow x=-31\)

Vậy x = -31

Answer 8

p/s : nhầm \(30^2\)

bình phương chia lm 2 trường hợp 

lm tiếp phần sau 

Answer 9

\(\frac{x+1}{60}=\frac{\left(-15\right)}{x+1}\)

\(=>(x+1).(x+1)=-15.60\)

\((x+1)²=-30²\)

\(=>x+1=-30\)

\(x=-30-1\)

\(x=-31\)

Vậy \(x=-31\)

~ HOK TỐT~

# han sara#