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\(\frac{4.5.6}{3.10.8}=\frac{2.2.5.2.3}{3.2.5.2.2}=1\)
chúc bn hok tốt
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C1 : 3/4 x 1/2 x 2
= 3/8 x 2
= 3/4
C2 : 3/4 x 1/2 x 2
= 3/4 x ( 1/2 x 2 )
= 3/4 x 1
= 3/4
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x*3/5+x*2/7=31/70
x*(3/5+2/7) =31/70
x*31/35 =31/70
x =31/70 :31/35
x = 1/2
\(x.\frac{3}{5}+x.\frac{2}{7}=\frac{31}{70}\)
\(x\left(\frac{3}{5}+\frac{2}{7}\right)=\frac{31}{70}\)
\(x\left(\frac{21}{35}+\frac{10}{35}\right)=\frac{31}{70}\)
\(\frac{31}{35}x=\frac{31}{70}\)
\(x=\frac{31}{70}:\frac{31}{35}\)
\(x=\frac{31}{70}.\frac{35}{31}\)
\(x=\frac{35}{70}\)
\(x=\frac{1}{2}\)
vay \(x=\frac{1}{2}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
MK ghi han dau x ra nha
1997 x 1996 - 1/1995 x 1997 - 1996
=(1997 x 1996) - ( 1997 x 1996) x 1/1997
=0 x 1/1997
=0