2 ^ -1 . 2^n + 4 . 2^n = 9 . 2^5
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`4/7 xx x -2/3=1/5`
`=> 4/7 xx x = 1/5+2/3`
`=> 4/7 xx x = 3/15 +10/15`
`=> 4/7 xx x =13/15`
`=> x= 13/15 : 4/7`
`=> x=13/15 xx 7/4`
`=> x= 91/60`
`4/7xx` `x-2/3=1/5`
`7/7xx` `x=3/15+10/15`
`4/7xx` `x=13/15`
`x=13/15:4/7`
`x=13/15xx4/7`
`x=91/60`
Vậy `x=91/60`
`@Nae`
\(x-\dfrac{3}{5}=\dfrac{2}{3}\times\dfrac{1}{5}\\ \Rightarrow x-\dfrac{3}{5}=\dfrac{2}{15}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{3}{5}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{9}{15}\\ \Rightarrow x=\dfrac{11}{15}\)
Câu 1: (-13).(-11)=143
Câu 2 : -170-9+2+1:2+1=-179+2+1/2+1=-176+1/2=-175,5
Câu 3:-2/30-(-20/5)+16/4=-2/30+20/5+16/4=-1/15+4+4=-1/15+8=-1/15+120/15=121/15
(n54)2=n
<=>n108=n
<=>n108-n=0
<=>n.(n107-1)=0
<=>n=0 hoặc n107-1=0
<=>n=0 hoặc n107=1
<=>n=0 hoặc n=1
(n54)2 = n
=> n108 = n
<=> \(\left[\begin{array}{nghiempt}n=0\\n=1\end{array}\right.\)
a: 2/7=10/35
5/9=10/18
b: 7/8=14/16
14/5=14/5
c: 4/11=60/165
5/12=60/144
3/5=60/100
a: 2/7=10/35
5/9=10/18
b: 7/8=14/16
14/5=14/5
c: 4/11=60/165
5/12=60/144
3/5=60/100
\(2^{-1}.2^n+4.2^n=9.2^5\)
\(=>\frac{1}{2}.2^n+4.2^n=9.2^n=>2^n.\left(\frac{1}{2}+4\right)=9.2^n=>2^n.\frac{9}{2}=9.2^5\)
\(=>2^n=9.2^5:\frac{9}{2}=64=2^6=>n=6\)