18/27 - 2/6 = giúp mình với
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
`2/9 + 6/27 + 8/36 + 12/54 + 16/72 + 18/81`
`= 2/9 + 2/9 + 2/9 + 2/9 + 2/9 + 2/9`
`= 2/9 xx 6`
`= 12/9 = 4/3`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{18}{27}\) - \(\dfrac{2}{6}\)
= \(\dfrac{18\times2}{27\times2}\) - \(\dfrac{2\times9}{6\times9}\)
= \(\dfrac{36}{54}\) - \(\dfrac{18}{54}\)
= \(\dfrac{18}{54}\)
= \(\dfrac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=7*2*(3-1)+27:(18-5)-6
=14*2 +27:(18-5)-6
=28+27=55:(18-5)-6
=55:13-6=55:7
=7 du 6
![](https://rs.olm.vn/images/avt/0.png?1311)
18-(x+14):3=27
(x+14):3=18-27
(x+14):3= -9
(x+14)= -9 nhân 3
x+14= -27
x= -27 -14
x= -41
![](https://rs.olm.vn/images/avt/0.png?1311)
(-12) + (-18)
= -30
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(-90) + 27 + (-10) + 73
= [(-90) + (-10) + (27 + 73)
= -100 + 100
= 0
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25 . (-5) . (-4)
= 25 . (-4) . (-5)
= -100 . (-5)
= 100 . 5
= 500
----------------------------------------
(-15) . 40 : 6
= [(-15) . 40] : 6
= (-600) : 6
= -100
-----------------------------------
(-27) . 58 + (-27) . 42
= (-27) . (58 + 42)
= (-27) . 100
= -2700
![](https://rs.olm.vn/images/avt/0.png?1311)
c,2x2+(−6)3:27=0c,2x2+(-6)3:27=0
⇒2x2+(−216):27=0⇒2x2+(-216):27=0
⇒2x2+(−8)=0⇒2x2+(-8)=0
⇒2x2=0−(−8)⇒2x2=0-(-8)
⇒2x2=8⇒2x2=8
⇒x2=8:2⇒x2=8:2
⇒x2=4⇒x2=4
⇒{x2=22x2=(−2)2⇒{x2=22x2=(-2)2
⇒{x=2x=−2⇒{x=2x=-2
Vậy x∈{(−2);2}
= 6 nha bạn
MSG:54
18/27 = 36/54
2/6 = 18/54
54/54 = 1