168-2*(x=3)=92
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a)AM là trung tuyến => AM=1/2 BC => BC=7 cm
AB2=72-52=24 =>AB= \(\sqrt{24}\)
b)AN = 2,5cm thì dùng Pitago ra NB.
AP = \(\frac{\sqrt{24}}{2}\) dùng Pitago ra CP.
Trả lời
)AM là trung tuyến => AM=1/2 BC => BC=7 cm
AB2=72-52=24 =>AB= \(\sqrt{24}\)
b)AN = 2,5cm thì dùng Pitago ra NB.
AP = \(\frac{\sqrt{24}}{2}\) dùng Pitago ra CP.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2^{x-3}-3.2^x=-92\)
\(\Rightarrow2^x\left(2^{-3}-3\right)=-92\)
\(\Rightarrow2^x.\dfrac{-23}{8}=-92\Rightarrow2^x=32\)
\(\Rightarrow2^x=2^5\Rightarrow x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ta co :
x*2*3*4=168
x*2*3=168:4
x*2=42:3
x=14:2
x=7
vay :7*2*3*4=168
cho mih 1 dung nhe
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2³.3⁴ + 92.81 - 6³.5
= 8.81 + 92.81 - 216.5
= 81.(8 + 92) - 1080
= 81.100 - 1080
= 8100 - 1080
= 7020
23 . 34+92.81-63.5
=8.81+92.81-216.5
= 81.(8+92)-1080
=81.100-1080
=8100-1080
= 7020
![](https://rs.olm.vn/images/avt/0.png?1311)
1) \(\dfrac{1}{4}x-\dfrac{1}{3}=\dfrac{-5}{9}\)
\(\Rightarrow\dfrac{1}{4}x=-\dfrac{2}{9}\Rightarrow x=-\dfrac{8}{9}\)
2) \(2^{x-3}-3.2^x=-92\)
\(\Rightarrow2^x\left(2^{-3}-3\right)=-92\)
\(\Rightarrow2^x.\dfrac{-23}{9}=-92\)
\(\Rightarrow2^x=32\Rightarrow x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2^{x-3}-3.2^x=-92\)
\(2^x:2^3-3.2^x=-92\)
\(2^x.\left(\frac{1}{8}-3\right)=-92\)
\(2^x.\frac{-23}{8}=-92\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
168 - 2* (x - 3) = 90
2 * ( x- 3) = 168 - 90
2 *( x - 3) = 78
x- 3 = 78 :2
x - 3 = 39
x = 39 + 3
x = 42
Nếu là x - 3 thì:
168 - 2 \(\times\) (x - 3) = 92
2 \(\times\) (x - 3) = 168 - 92
2 \(\times\) (x - 3) = 76
x - 3 = 76 : 2
x - 3 = 38
x = 38 + 3
x = 41
GOOD LUCK!