x5 - 52 = - 31
=> x5 = - 31 + 52
=> x5 = 21
=> x = 21 : 5
=> x = 4,2
x5-52=-31
=>x5=-31+52=21
=>x=21:5=4.2
vậy x=4.2
x5 - 52 = - 31
=> x5 = - 31 + 52
=> x5 = 21
=> x = 21 : 5
=> x = 4,2
x5-52=-31
=>x5=-31+52=21
=>x=21:5=4.2
vậy x=4.2
\(\frac{x}{5}\)-\(\frac{5}{2}\) =-31. Tim x
1)tim x bit a)(1/2-1/3).6^x+6^x+2=6^15+6^18
b)3^x+3^x+2=2430
c)(2x-15)^5=(2x-15)^3
2) so saanh a)2^11 va 5^35
b)2^31 va 3^21
c)2^15 va 27^5.49^8 d)21^15 va 27^5.49^8
A=2004+\(\sqrt{2003-x}\)
a)Tim x de A co nghia
b)Tim x de A=2005
c)Tim GTNN cua A
(x^2-1)(x^2-11)(x^2-21)(x^2-31)=-4924
Chứng minh rằng:
a) 87 - 218
b) (6x+11y) ⋮ 31 <=> (x+7y) ⋮ 31 với x,y ∈ Z
Giúp mk với!
31-2x/x+23 = 9/4. Tìm x
Cho ham so y=f(x) =12/x
c) tim x de y <0
d) tim x thuoc Z de y nhan GTLN
Tim x thuoc Z de A thuoc Z va tim gia tri do .
a/ A= x+3/x-2 .
b/ A= 1-2x/x+3 .
Tìm x biết
3.|x-2| - |-9| = 12
6(x- 2) - (x-3) = 31