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x:2 +x:4x6 +x :2x4 = ?
=> x:2+x:24+x:8 = ?
=> x:(2+24+8) =?
=> x:34 = ?
(đề bài thiếu hả bạn)
`(2/(2xx4)+2/(4xx6)+2/(6xx8)+2/(8xx10))xxy=1/3`
`=>(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)xxy=1/3`
`=>(1/2-1/10)xxy=1/3`
`=>(5/10-1/10)xxy=1/3`
`=>4/10xxy=1/3`
`=>2/5xxy=1/3`
`=>y=1/3:2/5`
`=>y=1/3xx5/2`
`=>y=5/6`
ax4=1/2-1/4+1/4-1/6+1/6+1/8+.......+1/16-1/18+1/18+1/20
ax4 =1/2-1/20
ax4 =9/20
a=9/20:4
a=9/80
A=\(\frac{2}{2x4}+\frac{2}{4x6}+.........+\frac{2}{2014x2016}\)
=\(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+.............+\frac{1}{2014}-\frac{1}{2016}\)
=\(\frac{1}{2}-\frac{1}{2016}\)
=\(\frac{1008}{2016}-\frac{1}{2016}\)
=\(\frac{1007}{2016}\)
\(\left(\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+...+\frac{1}{18.20}\right).10-x=0\)
\(2\left(\frac{2}{2.4}+\frac{2}{4.6}+\frac{2}{6.8}+...+\frac{2}{18.20}\right).10-x=0\)
\(2\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+\frac{1}{6}-\frac{1}{8}+...+\frac{1}{18}-\frac{1}{20}\right).10-x=0\)
\(2\left(\frac{1}{2}-\frac{1}{20}\right).10-x=0\)
\(2.\frac{9}{20}.10-x=0\)
\(9-x=0\)
\(x=9-0\)
\(x=9\)
Xx0,5+Xx0,25x6+Xx0,5x4=8
Xx0,5+Xx1,5+Xx2=8
Xx(0,5+1,5+2)=8
Xx4 =8
X =8:4
X =2