Finding the values of $a$ and $b$
30331
Steps to solve this system of equations: $\sqrt{x}+y=7$, $\sqrt{y}+x=11$
39563
How to show $a,b$ coprime to $n\Rightarrow ab$ coprime to $n$?
70311
Trying to prove (A ∩ B) − C = (A − C) ∩ (B − C)
156702
Finding value of an expression
58133
${a^2}{\mid}({b^3} + 1)\;$and$\;{b^2}{\mid}({a^3} + 1)$
106441
Find the value of $\binom{2000}{2} + \binom{2000}{5} + \binom{2000}{8} + \cdots \binom{2000}{2000}$
77547
Find integers $a,b,c,d$ such that
128091
Find the range of possible values of $\sqrt{a^2+a+1}-\sqrt{a^2-a+1}$
145966
Find $P(A\ xor\ B\ |\ A\ \cup\ B)$
19457
Show that: $\inf(A+B) = \inf(A)+ \inf(B)$
38662
If $a,b$ are the roots of the equation $2 x^2 -3 x +1 = 0$, find an equation whose roots are $a/(2b +3)$, $b/(2a +3)$
61533
Solution af a system of 2 quadratic equations
85167
When A and B are of different order given the $\det(AB)$,then calculate $\det(BA)$
127296
prove that a|b and b|a iff a=+-b
24856
Proving sup(A + B) = sup A + sup B
24499
Finding $(a, b, c)$ with $ab-c$, $bc-a$, and $ca-b$ being powers of $2$
81618
Prove $||a|-|b| | \leq |a-b|$