\(2^x+2^{x+3}=144\\ 2^x\left(1+2^3\right)=144\\ 2^x.9=144\\ 2^x=16\\ 2^x=2^4\\ \Rightarrow x=4\)

\(2^x+2^x+3=144\)

\(2\left(2^x\right)=144-3\)

\(2\left(2^x\right)=141\)

\(2^x=\frac{141}{2}\)

vô lí nhỉ????

ai giup mink nha

\(S=1+2+5+14+...+\frac{3^{n-1}+1}{2}\)

\(=\frac{3^0+1}{2}+\frac{3^1+1}{2}+\frac{3^2+1}{2}+\frac{3^3+1}{2}+...+\frac{3^{n-1}+1}{2}\)

\(=\frac{\left(3^0+3^1+3^2+3^3+...+3^{n-1}\right)+\left(1+1+1+1+...+1\right)}{2}\)(tổng thứ 2 trên tử có n chữ số 1)

Đặt \(K=3^0+3^1+3^2+3^3+...+3^{n-1}\)

\(\Rightarrow3K=3^1+3^2+3^3+3^4+...+3^n\)

\(\Rightarrow3K-K=3^1+3^2+3^3+3^4+...+3^n\)\(-3^0-3^1-3^2-3^3-...-3^{n-1}\)

\(\Rightarrow2K=3^n-1\Rightarrow K=\frac{3^n-1}{2}\)

\(\Rightarrow S=\frac{\frac{3^n-1}{2}+n}{2}=\frac{3^n+2n-1}{4}\)

Vậy \(S=\frac{3^n+2n-1}{4}\)

\(\frac{0,55.\sqrt{10000}-\sqrt{1}}{6}\)

\(=\frac{55-\sqrt{1}}{6}\)

\(=\frac{54}{6}=9\)

We should keep the environment clean.

=>The environment....should be kept clean..............................

The environment should be kept clean.

Học tốt!

a)ta có góc ABC+góc ACB + góc BCA=180 độ ( tổng 3 góc của tam ABC)

=> 50 độ+ góc ACB+80 độ =180 độ

=> góc ACB = 180-50-80=50 độ

Tam giác ABC có góc B = góc C=50 độ 

=> tam giác ABC cân tại A

1 How heavy is the chicken ? => What.......is the weight of the chicken.......?

2 You shouldn't eat too much candy? => You ' d....better not eat too much meat....?

1. What is the chicken's weight?

2.You'd better not eat too much candy

Hok tốt

\(\frac{25^{25}.7^{30}}{5^{48}.49^{16}}=\frac{\left(5^2\right)^{25}.7^{30}}{5^{48}.\left(7^2\right)^{16}}=\frac{5^{50}.7^{30}}{5^{48}.7^{32}}=\frac{5^2}{7^2}=\frac{25}{49}\)

hok tốt!!!

\(\frac{25^{25}.7^{30}}{5^{48}.49^{16}}=\frac{\left(5^2\right)^{25}.7^{30}}{5^{48}.\left(7^2\right)^{16}}=\frac{5^{30}.7^{30}}{5^{48}.7^{32}}=\frac{5^{48}.5^2.7^{30}}{5^{48}.7^{30}.7^2}=\frac{25}{49}\)

Cho xin cái đề bài bạn ơi

đề bạn nhé

hok tốt

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bn tham khảo ở đây nhé!! hok tốt!!!