Tìm x:
\(\frac{x-2}{11}+\frac{x-2}{12}+\frac{x-2}{13}=\frac{x-2}{14}+\frac{x-2}{15}\)
tìm x
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\Leftrightarrow\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}-\frac{x+2}{14}-\frac{x+2}{15}=0\)
\(\Leftrightarrow\left(x+2\right)\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\right)=0\)
Mà \(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\ne0\)
\(\Rightarrow x+2=0\Rightarrow x=-2\)
x = -2. chọn mình nha .đúng 100% đó
tìm x
\(A=\frac{x+2}{10}+\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
A=\(\frac{x+2}{10}+\frac{x+2}{11}+\frac{x+2}{12}\)\(+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\frac{x+2}{10}+\frac{x+2}{11}+\frac{x+2}{12}\)\(+\frac{x+2}{13}\)-\(\frac{x+2}{14}-\frac{x+2}{15}=0\)
\(\left(x+2\right).\left(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\right)=0\)
x+2=0 vì \(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\)khác\(0\)
x=0-2=-2
Vậy x=-2
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+3}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
(x+2)/11+(x+2)/12+(x+2)/13=(x+2)/14+(x+2)/15
(x+2)(1/11+1/12+1/13)=(x+2)(1/14+1/15)
(x+2)(1/11+1/12+1/13)-(x+2)(1/14+1/15)=0
(x+2)(1/11+1/12+1/13-1/14-1/15)=0
mà 1/11+1/12+1/13-1/14-1/15 #0
nên x+2=0
x=0-2
x=-2
Vậy x=-2
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
<=>\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}-\frac{x+2}{14}-\frac{x+2}{15}=0\)
<=>\(\left(x+2\right)\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\right)\)=0
<=> x+2=0 (vì 1/11 + 1/12+1/13-1/14 #0)
vậy x = -2
Tìm x biết:\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
Nhanh nhanh,ns cách làm thôi cũng đc nha!!!!!!!!!!!
Chuyển 2 phân số ở vế kia sang rồi đặt (x+2) ra ngoài....Từ đó có (x+2)=0=>x=-2
-2 để vế trên =0 là xong hết mak!!! =)))))) Bà con ủng hộ vài l-i-k-e nhá
tìm x,biết:
a)\(\frac{2}{\left(x+2\right)\left(x+4\right)}+\frac{4}{\left(x+4\right)\left(x+8\right)}+\frac{6}{\left(x+8\right)\left(x+14\right)}=\frac{x}{\left(x+2\right)\left(x+14\right)}\)
b)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
c)\(\left(x+2\right)^2=\frac{38}{25}+\frac{9}{10}-\frac{11}{15}+\frac{13}{21}-\frac{15}{28}+\frac{17}{36}-...+\frac{197}{4851}-\frac{199}{4950}\)
giúp tớ với,huhu
Tìm x biết:
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
Bài này dễ mà phải không các bạn
Bài này mình làm nhiều chắn lắm rồi
Kết quả x = -2
tìm biết :
\(\frac{x+2}{17}+\frac{x+14}{15}+\frac{x+6}{13}=\frac{x+8}{11}+\frac{x+10}{9}\frac{x+12}{7}\)
vế trái có bị sai ko em. chị nghĩ câu hỏi nên là: x+2/17 + x+4/15 + x+6/13=x+8/11 + x+10/9 + x+12/7