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\(\frac{11}{8}+\frac{13}{6}=\frac{85}{x}\)
\(\frac{85}{24}=\frac{85}{x}\)
\(x=24\)
\(2x-\frac{2}{11}=1\frac{1}{5}\)
\(2x-\frac{2}{11}=\frac{6}{5}\)
\(2x=\frac{76}{55}\)
\(x=\frac{38}{55}\)
a. \(\frac{11}{8}\)+ \(\frac{13}{6}\)= \(\frac{85}{x}\)
\(\frac{85}{24}\) =\(\frac{85}{x}\)
x = \(\frac{24\cdot85}{85}\)
x = 24
b. 2x - \(\frac{2}{11}\)=1\(\frac{1}{5}\)
2x- \(\frac{2}{11}\)= \(\frac{6}{5}\)
2x = \(\frac{6}{5}\)+\(\frac{2}{11}\)
x = \(\frac{76}{55}\): 2
x = \(\frac{38}{55}\)
Học tốt nha ~~~~~ ỌvỌ
![](https://rs.olm.vn/images/avt/0.png?1311)
(x+2)/17+(x+4)/15+(x+6)/13=(x+8)/11+(x+10)/9+(x+12)/7
=>(x+2+17)/17+(x+4+15)/15+(x+6+13)/13=(x+8+11)/11+(x+10+9)/9+(x+12+7)/7
=>(x+19)/17+(x+19)/15+(x+19)/13=(x+19)/11+(x+19)/9+(x+19)/7
=>(x+19)/17+(x+19)/15+(x+19)/13-(x+19)/11-(x+19)/9-(x+19)/7=0
=>(x+19)*(1/17+1/15+1/13-1/11-1/9-1/7)=0
=>x+19=0
=>x=19
áp dụng tc tỉ lệ thức ta có :
\(\Leftrightarrow\frac{671x+2804}{3315}=\frac{239x+2462}{693}\Rightarrow\left(671x+2804\right)693=3315\left(239x+2462\right)\)
=>(671x+2804)693=693(671x+2804) (VT)
<=>693(671x+2804)=3315(239x+2462)
=>465003x+1943172=792285x+8161530
=>-327282x=621835
=>x=621835:(-327282)
=>x=-19
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=81\cdot\left(\frac{12-\frac{12}{7}-\frac{12}{289}-\frac{12}{85}}{4-\frac{4}{7}-\frac{4}{289}-\frac{4}{85}}:\frac{5+\frac{5}{13}+\frac{5}{169}+\frac{5}{91}}{6+\frac{5}{13}+\frac{5}{169}+\frac{5}{91}}\right)\cdot\frac{158158158}{711711711}\)
\(B=81\cdot\left(\frac{12\left(1-\frac{1}{7}-\frac{1}{289}-\frac{1}{85}\right)}{4\left(1-\frac{1}{7}-\frac{1}{289}-\frac{1}{85}\right)}:\frac{5\left(1+\frac{1}{13}+\frac{1}{169}+\frac{1}{91}\right)}{5\left(1+\frac{1}{13}+\frac{1}{169}+\frac{1}{91}\right)+1}\right)\cdot\frac{2}{9}\)
\(B=81\cdot\left(\frac{12}{4}:\frac{6470}{7653}\right)\cdot\frac{2}{9}\)
Xem lại đề bài bẹn owii -.-
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{-11}{8}-\frac{-13}{6}=\frac{5}{x}\)
=> \(\frac{-33}{24}-\frac{-52}{24}=\frac{5}{x}\)
=> \(\frac{\left(-33\right)-\left(-52\right)}{24}=\frac{5}{x}\)
=> \(\frac{19}{24}=\frac{5}{x}\)
=> \(19x=24\cdot5\)
=> \(19x=120\)
=> \(x=\frac{120}{19}\)
\(\frac{11}{8}+\frac{13}{6}=\frac{85}{x}\)
\(\frac{85}{24}=\frac{85}{x}\)
\(=>x=24\)
Học tốt
\(\frac{11}{8}+\frac{13}{6}=\frac{85}{x}\)
\(\Leftrightarrow\frac{85}{24}=\frac{85}{x}\)
\(\Leftrightarrow85\times x=85\times24\)
\(\Leftrightarrow85\times x=2040\)
\(\Leftrightarrow x=24\)
Vậy \(x=24\)