[tex]c=(2^{40}+2^{39}+2^{38}):7\\c=2^{38}(2^2+2+1):7=2^{38}\cdot7:7=2^{38}=2^{19\cdot2}=(2^{19})^2 \implies c \ este \ p.p.[/tex]
[tex]d=(4^{50}+4^{49}+4^{48}):21\\d=4^{48}(4^2+4+1):21=4^{48}\cdot21:21=4^{48}=(2^{2})^{48}=(2^{48})^2 \implies d \ este \ p.p.[/tex]
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[tex]c=(2^{40}+2^{39}+2^{38}):7\\c=2^{38}(2^2+2+1):7=2^{38}\cdot7:7=2^{38}=2^{19\cdot2}=(2^{19})^2 \implies c \ este \ p.p.[/tex]
[tex]d=(4^{50}+4^{49}+4^{48}):21\\d=4^{48}(4^2+4+1):21=4^{48}\cdot21:21=4^{48}=(2^{2})^{48}=(2^{48})^2 \implies d \ este \ p.p.[/tex]