(x+4/10 + 1) + (x+3/11 +1) = (x+2/12 +1) + (x+1/13 +1)
(x+4/10 + 1) + (x+3/11 +1) - (x+2/12 +1) - (x+1/13 +1)=0
x+14/10 + x+14/11 - x+14/12 - x+14/13=0
x+14.(1/10 + 1/11 - 1/12 - 1/13)=0
1/10>1/11>1/12>1/13 nên dễ thấy 1/10+ 1/11 - 1/12 - 1/13 khác 0
=> x+14=0
x= -14
Tìm x biết
a) x+2x+3x+4x+...+100x=-213
b)\(\frac{1}{2}x-\frac{1}{3}=\frac{1}{4}x-\frac{1}{6}\)
c)3(x-2)+2(x-1)=10
d)\(\frac{x+1}{3}=\frac{x-2}{4}\)
e)\(\frac{x-6}{7}+\frac{x-7}{8}+\frac{x-8}{9}=\frac{x-9}{10}+\frac{x-10}{11}+\frac{x-11}{12}\)
f)\(\frac{x+32}{11}+\frac{x+23}{12}=\frac{x+38}{13}+\frac{x+27}{14}\)
Tìm x biết
CAU 1)\(\frac{X+Y}{z}=\frac{y+z}{x}=\frac{x+z}{y}\)
Khi đó x+y=kz Khi đó K=
CAU 2)Tìm X biết :
\(\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}+\frac{x+2}{12^{12}}+\frac{x+2}{13^{13}}\)
X =
CAU 3)tÍNH
\(S=\frac{1}{2}-\frac{1}{3}-\frac{1}{4}-...-\frac{1}{20}+\frac{3}{2}+\frac{4}{3}+\frac{5}{4}+...+\frac{21}{20}=\)
TÌM X BIẾT:\(\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}+\frac{x+2}{12^{12}}+\frac{x+2}{13^{13}}\)
giúp mik với ạk
Tìm x biết :
\(\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}=\frac{x+2}{12^{12}}+\frac{x+2}{13^{13}}\)
tìm x biết
\(\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}=\frac{x+2}{12^{12}}+\frac{x+2}{13^{13}}\)
Tìm x biết :
\(\frac{x+2}{10^{10}}+\frac{x+2}{11^{11}}=\frac{x+2}{12^{12}}+\frac{x+2}{13^{13}}\)
Tìm số hữu tỉ x , biết rằng
e,\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
f, \(\frac{x+4}{2000}+\frac{x+3}{2001}=\frac{x+2}{2002}+\frac{x+1}{2003}\)
Bài 2
a) Tìm x biết\(\frac{1}{2}-\left|\frac{5}{4}-2x\right|=\frac{1}{3}\)
b) Tìm x biết \(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
c) Tìm ba số x, y, z thỏa mãn: \(\frac{x}{y}=\frac{10}{9};\frac{y}{z}=\frac{3}{4}\)và \(x-y+z=78\)