Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\) \(\left(a\ne5,b\ne6\right)\). Như vậy tỉ số \(\frac{a}{b}\) bằng .....
\(Cho\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5,b\ne6\right).Cmr\frac{a}{b}=\frac{5}{6}\)
Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5;b\ne6\right)CMR:\frac{a}{b}=\frac{5}{6}\)
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59. Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5;b\ne6\right)\). Chứng minh rằng \(\frac{a}{b}=\frac{5}{6}\)
\(\left(a+5\right)\left(b-6\right)=\left(a-5\right)\left(b+6\right)\)
\(\Leftrightarrow ab-6a+5b-30=ab+6a-5b-30\)
\(\Leftrightarrow ab-ab+5b+5b-30+30=6a+6a\)
\(\Leftrightarrow10b=12a\)
\(\Rightarrow\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\left(đpcm\right)\)
a+5/a-5=b+6/b-6=a+5/b+6=b+6/b-69 (giao hoán trung tỉ)=>(a+5)-5/(b+6)-6=(a+5)-a/(b+6)-6=a/b=5/6
BẠN ƠI CÁI MÀ '/' LÀ PHẦN NHA
Cho \(\dfrac{a+5}{a-5}=\dfrac{b+6}{b-6}\left(a\ne5,b\ne6\right)\). Như vậy tỉ số \(\dfrac{a}{b}\) bằng bao nhiêu?
\(\dfrac{a+5}{a-5}=\dfrac{b+6}{b-6}\)
=>(a+5)(b-6)=(a-5)(b+6)
=>ab-6a+5b-30=ab+6a-5b-30
=>-6a+5b=6a-5b
=>-12a=-10b
=>6a=5b
hay a/b=5/6
Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5;b\ne6\right).\)Chứng minh rằng \(\frac{a}{b}=\frac{5}{6}\)
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)
<=> \(\frac{a-5+10}{a-5}=\frac{b-6+12}{b-6}\)
<=> \(1+\frac{10}{a-5}=1+\frac{12}{b-6}\)
<=> \(\frac{10}{a-5}=\frac{12}{b-6}\)
<=> 10( b - 6 ) = 12( a - 5 )
<=> 5( b - 6 ) = 6( a - 5 )
<=> 5b - 30 = 6a - 30
<=> 5b = 6a
<=> \(\frac{6}{5}=\frac{b}{a}\)hay \(\frac{a}{b}=\frac{5}{6}\)( đpcm )
cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)\(\left(a\ne5;b\ne6\right)\)tìm \(\frac{a}{b}\)
Ta có: \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)
\(\Rightarrow\left(a+5\right).\left(b-6\right)=\left(a-5\right).\left(b+6\right)\)
\(ab-6a+5b-30=ab+6a-5b-30\)
\(\Rightarrow5b-6a=6a-5b\)
\(5b+5b=6a+6a\)
\(10b=12a\)
\(\Rightarrow\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\)
Vậy \(\frac{a}{b}=\frac{5}{6}\)
Tham khảo nhé~
Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5;b\ne6\right)\) Chứng minh rằng \(\frac{a}{b}=\frac{5}{6}\)
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)
\(\Leftrightarrow\frac{a-5+10}{a-5}=\frac{b-6+12}{b-6}\)
\(\Leftrightarrow1+\frac{10}{a-5}=1+\frac{12}{b-6}\)
\(\Leftrightarrow\frac{10}{a-5}=\frac{12}{b-6}\)
\(\Rightarrow10.\left(b-6\right)=12.\left(a-5\right)\)
\(10b-60=12a-60\)
\(10b=12a\)
\(\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\)
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)
\(=>\frac{a+5}{b+6}=\frac{a-5}{b-6}=\frac{a+5-\left(a-5\right)}{b+6-\left(b-6\right)}=\frac{a+5-a+5}{b+6-b+6}=\frac{10}{12}=\frac{5}{6}\)
\(\frac{a+5}{b+6}=\frac{a-5}{b-6}=\frac{a+5+\left(a-5\right)}{b+6+\left(b-5\right)}=\frac{a+5+a-5}{b+6+b-6}=\frac{2a}{2b}=\frac{a}{b}\)
=>\(\frac{a}{b}=\frac{a+5}{b+5}=\frac{5}{6}\)
=>\(\frac{a}{b}=\frac{5}{6}\)
Cho \(\frac{a+5}{a-5}=\frac{b+6}{b-6}\) ( với \(a\ne5\text{ , }b\ne6\) )
Tính tỉ số \(\frac{a}{b}\)
Bài giải
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\)
\(\Rightarrow\text{ }\frac{a+5}{b+6}=\frac{a-5}{b-6}=\frac{\left(a+5\right)+\left(a-5\right)}{\left(b+6\right)+\left(b-6\right)}=\frac{2a}{2b}=\frac{a}{b}=\frac{\left(a+5\right)-\left(a-5\right)}{\left(b+6\right)-\left(b-6\right)}=\frac{10}{12}=\frac{5}{6}\)
( Áp dụng tính chất của dãy tỉ số bằng nhau )
\(\Rightarrow\text{ }\frac{a}{b}=\frac{5}{6}\)
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5,b\ne6\right)\)
tính \(\frac{a}{b}\)Mình cần gấp nên mong mn giúp mink nha
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\\ \Rightarrow\left(a+5\right)\left(b-6\right)=\left(b+6\right)\left(a-5\right) \\ \Leftrightarrow ab-6a+5b-30=ab-5b+6a-30\\ \Leftrightarrow12a=10b\\ \Leftrightarrow\frac{a}{10}=\frac{b}{12}=\frac{a}{b}=\frac{10}{12}=\frac{5}{6}\)
Vậy \(\frac{a}{b}=\frac{5}{6}\)
\(\frac{a+5}{a-5}=\frac{b+6}{b-6}\left(a\ne5;b\ne6\right).\)
\(\Rightarrow\left(a+5\right).\left(b-6\right)=\left(a-5\right).\left(b+6\right)\)
\(\Rightarrow ab-6a+5b-30=ab+6a-5b-30\)
\(\Rightarrow ab-6a+5b=ab+6a-5b\)
\(\Rightarrow-6a+5b=6a-5b\)
\(\Rightarrow-6a-6a=-5b-5b\)
\(\Rightarrow-12a=-10b\)
\(\Rightarrow12a=10b\)
\(\Rightarrow\frac{a}{b}=\frac{10}{12}\)
\(\Rightarrow\frac{a}{b}=\frac{5}{6}.\)
Vậy \(\frac{a}{b}=\frac{5}{6}.\)
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