\(5^{n+1}-4\cdot5^n\)
\(=5^n\cdot5-4\cdot5^n\)
\(=5^n\left(5-4\right)\)
\(=5^n\)
\(5^{n+1}-4\cdot5^n\)
\(=5^n\cdot5-4\cdot5^n\)
\(=5^n\left(5-4\right)\)
\(=5^n\)
Tinh:
5n+1-4.5n
1. Thu gọn
a, 3x^n-2 . (x^n+2 -y^n+2 ) + y^n+2 . (3x^n-2 - y^n-2 )
b, 3x^n.(6x^n-3+1)-2x^n . (9x^n-3-1)
c, 5^n+1-4.5^n
d,6x^n : (x^2-1)+2x. (3x^n-1+1)
Tính:
a. 3xn(6xn-3 + 1) - 2xn(9xn-3 -1)
b. 5n+1 - 4.5n
c. 62.64-43(36-1)
thu gọn:
a/ \(5^{n+1}-4.5^n\)
b/\(6^2.6^4-4^3.\left(3^6-1\right)\)
so sánh A=5^32 -1 và B = (5^2-4.5+1)(5^2+1)(5^4 +1)(5^8+1)(5^16+1)
Tim X
x(2x-1)(x+5) - (2x^2 +1)(x + 4.5) =3.5
giup minh nha
GIẢI PT:
\(\left(1+\frac{1}{5}+\frac{1}{5^2}+...+\frac{1}{5^{99}}\right)x+\frac{1}{4.5^{99}.x}=\frac{1}{50}+\frac{1}{150}+\frac{1}{300}+...+\frac{1}{9500}\)
tìm x
\(x\left(2x-1\right)\left(x+5\right)-\left(2x^2+1\right)\left(x+4.5\right)=3.5\)
Tìm x :
a) x(2x-1)(x+5)-(2x^2+1)(x+4.5)=3.5
dấu .(chấm) là nhân nha