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\(\frac{9}{4}x\frac{13}{10}-\frac{3}{4}x\frac{11}{10}+\frac{3}{4}:\frac{10}{72}\)
\(=\frac{39}{4}x\frac{3}{10}-\frac{11}{4}x\frac{3}{10}+\frac{72}{4}x\frac{3}{10}\)
\(=\frac{3}{10}x\left(\frac{39}{4}-\frac{11}{4}+\frac{72}{4}\right)\)
\(=\frac{3}{10}x25\)
\(=\frac{15}{2}\)
= 3x3/4x13/10-3/4x11/10+3/4x72/10
= 3/4x(3x13/10-11/10+72/10)
= 3/4x10
=30/4
=15/2
mih nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Dãy này có: (10-1):1+1=10 số hạng
trung bình 1 số là: ( 10/11 +1/11):2=1/2
tổng của dãy là: 1/2*10=5 đ/s:5
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`4/7+4`
`=4/7+4/1`
`=4/7+28/7`
`=32/7`
__
`3+6/11`
`=33/11+6/11`
`=39/11`
__
`3-5/7`
`=3/1-5/7`
`=21/7-5/7`
`=16/7`
__
`21/9-2`
`=21/9-18/9`
`=3/9`
`=1/3`
__
`15/24+2`
`=15/24+48/24`
`=63/24`
`=21/16`
__
`63/45-20/25`
`=63/45-4/5`
`=63/45-36/45`
`=27/45`
`=9/15`
__
`3/4-2/8`
`=3/4-1/4`
`=2/4`
__
`6/7-5/8`
`=48/56-35/56`
`=13/56`
__
`37/45-5/9`
`=37/45-25/45`
`=12/45`
`=4/15`
__
`46/39-11/13`
`=46/39-33/39`
`=13/39`
`=1/2`
__
`5/12+3/4+1/3`
`=5/12+9/12+4/12`
`=14/12+4/12`
`=18/12`
`=3/2`
__
`1/2+3/7+11/14`
`=7/14+6/14+11/14`
`=13/14+11/14`
`=24/14`
`=12/7`
__
`7/10-(1/5+1/4)`
`=7/10-(4/20+5/20)`
`=7/10-9/20`
`=14/20-9/20`
`=5/20`
`=1/4`
__
`15/4-2/3-3/4`
`=(15/4-3/4)-2/3`
`=12/4-2/3`
`=3-2/3`
`=9/3-2/3`
`=7/3`
4/5 x X = 40/33
X = 40/33 : 4/5
X = 50/33
x= ( 10/11 : 3/4 ) : 4/5 = 50 /33