`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`

\(x-\dfrac{3}{5}=\dfrac{2}{3}\times\dfrac{1}{5}\\ \Rightarrow x-\dfrac{3}{5}=\dfrac{2}{15}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{3}{5}\\ \Rightarrow x=\dfrac{2}{15}+\dfrac{9}{15}\\ \Rightarrow x=\dfrac{11}{15}\)

=>x-3/5=2/15

hay x=11/15

x-3/5=2/3 x1/5

x-3/5=2/15

x=2/15+3/5

x=2/15+9/15

x=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

(-13).(-11)

=13.11

=143

2.

(-179)-9+2+1:2+1

=(-179)-9+2+0.5+1

=(-188)+2+0.5+1

=(-186)+0.5+1

=(-184.5)

3.

(-2/3)-(-20/5)+16/4

=(-2/3)+20/5+16/4

=-40/60+240/60+240/60

=520/60=26/3

(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

<=> \(\left[\begin{array}{nghiempt}n=0\\n=1\end{array}\right.\)

\(\left(n^{54}\right)^{ }^2\)= n

\(n^{54.2}\)                                                  = n

\(n^{108}\)                                                   = n

    => n = 1 hoặc n = 0

5 + 2 + 6 + 3 + 8 + 4 + 1 + 0 + 9 + 7+ 10 = 55

Bằng 55

= 55 đúng không bạn

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