3 mũ 4-x=81 là viết như này hả bn

\(3^{4-x}=81\) hay viết như này \(3^4-x=81\)

cai thu nhat

Hoang Thi Thanh Tra

viet nhu cai thu nhat

sai đề rồi .Phải là tìm x mới đúng

Đề bài là Tìm x nhé

(2x+1)³=125

(2x+1)³=5³

\(\Rightarrow\)2x+1=5

2x=5-1

2x=4

x=4:2

x=2

8.6+288:(x-3)²=50

8.6+8.36:(x-3)²=50

8.(6+36):(x-3)²=50

8.42:(x-3)²=50

7.48:(x-3)²=50

a: \(\left(x+5\right)^2>=0\forall x\)

\(\left(2y-8\right)^2>=0\forall y\)

Do đó: \(\left(x+5\right)^2+\left(2y-8\right)^2>=0\forall x,y\)

Dấu '=' xảy ra khi \(\left\{{}\begin{matrix}x+5=0\\2y-8=0\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}x=-5\\y=4\end{matrix}\right.\)

b: \(\left(x+3\right)\left(2y-1\right)=5\)

=>\(\left(x+3\right)\left(2y-1\right)=1\cdot5=5\cdot1=\left(-1\right)\cdot\left(-5\right)=\left(-5\right)\cdot\left(-1\right)\)

=>\(\left(x+3;2y-1\right)\in\left\{\left(1;5\right);\left(5;1\right);\left(-1;-5\right);\left(-5;-1\right)\right\}\)

=>\(\left(x,y\right)\in\left\{\left(-2;3\right);\left(2;1\right);\left(-4;-2\right);\left(-8;0\right)\right\}\)

ai nhanhh mk h

\(27^3.9^4.243=3^{3.3}.3^{2.4}.3^5\)

\(3^9.3^8.3^5=3^{22}\)

\(25^3.125^2=5^{2.3}.5^{3.2}=5^6.5^6=5^{12}\)

(2n + 1)³ = 125

(2n + 1)³ = 5³

2n + 1 = 5

2n = 4

n = 2

(2.n+1)³=125

(2.n+1)³=5³

(2.n+1) =5

 2.n      =5-1

 2.n      =4

          n=4:2

           n=2

    (2.n+1)³=125

=>(2.n+1)³=5³

=>2.n+1=5

=>2.n=5-1

=>2.n=4

=>n=4:2

=>n=2

k mik nha

\( -8 ) . ( -3)^3 . ( + 125 ) \)

= \( -8 ) . ( -27 ) . ( 125 ) \)

= \( 216 . 125 \)

= \(2700\)

\(\left(-8\right).\left(-3\right)^3.125\)

\(=\left(-8\right).\left(-27\right).125\)

\(=8.27.125\)

\(=27000\)