\(1+3+5+7+9+...+\left(2x-1\right)=225\)
\(\Rightarrow\left(1+2x-1\right).\dfrac{2x-1+1}{4}=225\)
\(\Rightarrow2x.\dfrac{2x}{4}=225\)
\(\Rightarrow\dfrac{4x^2}{4}=225\)
\(\Rightarrow x^2=225\)
\(\Rightarrow x=15\)
Vậy x = 15.
\(1+3+5+7+9+...+\left(2x-1\right)=225\)
\(\Rightarrow\left(1+2x-1\right).\dfrac{2x-1+1}{4}=225\)
\(\Rightarrow2x.\dfrac{2x}{4}=225\)
\(\Rightarrow\dfrac{4x^2}{4}=225\)
\(\Rightarrow x^2=225\)
\(\Rightarrow x=15\)
Vậy x = 15.
1+3+5+7+9+.....+(2x-1)=225
Tìm x:
1+3+5+7+9+....+(2x-1)=225
Tìm số tự nhiên x, biết: a) 1+3+5+7+9+...+ (2x- 1)= 225
Tìm x biết :
1+3+5+7+9+....+(2x-1)=225
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
giúp minh vs mình đang cần gấp
1+3+5+7+....+(2x-1)=225
so sanh 9^200 va 27^133
2^180 va 8^61
2^101va 5^39
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
cần gấp
Tìm x biết : 1 + 3 + 5 + 7 + ... + 2x - 1 = 225