Prove that a fraction that has terminating decimals has its denominator as a multiple of only 2 and 5's.
46561
How can I prove that all rational numbers are either terminating decimal or repeating decimal numerals?
30429
How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?
158066
Prove $2^{1/3}$ is irrational.
81601
Prove that if $x$ is odd then $x^2 -1$ is divisible by $8$.
87055
How to prove $\frac{x}{1+x^2}0$?
136994
Proving :$\frac{1}{2ab^2+1}+\frac{1}{2bc^2+1}+\frac{1}{2ca^2+1}\ge1$
49851
when the sum of some fractions be $1$
41563
Prove that if the sum of digits of a number is divisible by 3, so is the number itself.
109365
Prove that 1/2 + 1/4 + 1/8 ....... = 1
55077
prove that $2\sqrt5 +\sqrt{11}$ is irrational
124868
Prove that $\frac{bc}{b+c}+\frac{ca}{c+a}+\frac{ab}{a+b}<\frac{a+b+c}{2}$
9435
Prove that $1^2+2^2+\cdots+n^2=\frac{n(n+1)(2n+1)}{6}$ for $n \in \mathbb{N}$.
133382
Proof that $a+b+\frac{1}{1+\sqrt{ab}}\geq\frac{5}{2}$
41418
$2+2 = 5$? error in proof
63804
Proof that every repeating decimal is rational
76032
Prove that if m is a square integer then m is neither congruent to 2 modulo 5 nor congruent to 3 modulo 5
3611
How to prove $n^5 - n$ is divisible by $30$ without reduction