Question

prove that 2^30+2^29+2^28/2^31+2^30-2^29=7/10

Answer 1

2^30+2^29+2^28/2^31+2^30-2^29
=2^-1+2^-1-2^-1
=-2+(-2)-(-2)
=-2-2+2
=-2

Answer 2

Let 2^28 be x.

Then,

2×2×x+2×x+x/2×2×2×x+2×2×x-x=7/10

=7x/10x

=7/10

HENCE PROVED