4/5-3/4.4/5-3/4
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{4}{5}-\dfrac{3}{4}.\dfrac{4}{5}.\dfrac{3}{4}\)
\(=\dfrac{4}{5}-\dfrac{9}{20}\)
\(=\dfrac{16}{20}-\dfrac{9}{20}\)
\(=\dfrac{7}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
tính bằng cách thuận tiện nhất
a x 3,7 + a x 5,3 + a = 45
![](https://rs.olm.vn/images/avt/0.png?1311)
`3x-16:2^3=31`
`=>3x-16:8=31`
`=>3x-2=31`
`=>3x=31+2`
`=>3x=33`
`=>x=11`
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`2^10:2^8+3[4.7+3.4]`
`=2^2+3[4(3+7)]`
`=4+3[4.10]`
`=4+3.40`
`=4+120`
`=124`
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`4^6:4^3-2^2 . 2^3`
`=4^3-2^5`
`=64-32`
`=32`
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`141+2^5 . 2^4-3^1 . 3^2`
`=141+2^9-3^3`
`=141+512-9`
`=644`
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`x+2^5:2^4=4.4^2`
`=>x+2=4^3`
`=>x=64-2`
`=>x=62`
![](https://rs.olm.vn/images/avt/0.png?1311)
1)
a) \(...=4^4-225=256-225=31\)
b) \(...=8.9.5+120=360-120=240\)
c) \(...=3^4-3^3=81-27=54\)
d) \(...=7^2-1=49-1=48\)
2) a) \(...=2^6=64\)
b) \(...=3^{15}:3^{10}=3^5=243\)
c) \(...=3^3-3^3=0\)
d) \(...=6^3+4^5=216+1024=1240\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= (4/5 - 4-5) . 3/4 = 0 . 3/4 = 0