| In this thesis,it is proved that every pair of sufficiently large even integers can be represented as not only a pair of one prime,one prime square,one prime cube,one prime biquadrate and 70 powers of 2,such that where k1=70,but also a pair of two squares of primes,two cubes of primes,two fourth powers of primes and 66 powers of 2,such that where k2=66. |