find y and x with : yxyx = x^2/4
2x( $x^{2}$ )
(D ^ 2 + 4D + 4) * y = e ^ (2x) + 2 ^ x
sum all this numbers:
30
20
300
30...
1615÷4
find the value of x if
x/500 x 100 = 2.5
factorize 21u-49v+35w
ind total number of terms in (1+x)^101.(1+x^2-x)^100
bˆ(2a)-4(a)ˆb=121
