Pueden ayudarme con el proceso de la 14 y 16 porfavor?

14. datos<img src="https://tex.z-dn.net/?f=AB%5Ccdot%20CD%3Dn~BC%5Ccdot%20AD%5C%5C%5C%5C%5Cdfrac%7B1%7D%7BAD%7D%2B%5Cdfrac%7Bn%7D%7BAB%7D%3D%5Cdfrac%7B6%7D%7BAC%7D%5C%5C%20%5C%5C%5Ctextbf%7BDesarrollo%3A%7D%5C%5C%20%5C%5C%5Cdfrac%7B1%7D%7BAD%7D%2B%5Cdfrac%7Bn%7D%7BAB%7D%3D%5Cdfrac%7B6%7D%7BAD-CD%7D%5C%5C%5C%5C%5C%5C%5Cdfrac%7BADn%2BAB%7D%7BAD%5Ccdot%20AB%7D%3D%5Cdfrac%7B6%7D%7BAD-CD%7D%5C%5C%5C%5C%5C%5C%28ADn%2BAB%29%28AD-CD%29%3D6AD%5Ccdot%20AB%5C%5C%28AD%29%5E2n%2BAD%28AB-CDn%29-AB%5Ccdot%20CD%3D6AD%5Ccdot%20AB%5C%5CAB%5Ccdot%20CD%3D%28AD%29%5E2n%2BAD%28AB-CDn%29-6AD%5Ccdot%20AB%5C%5CAB%5Ccdot%20CD%3D%28AD%29%5E2n-AD%285AB%2BCDn%29%5C%5C%5C%5Cn~BC%5Ccdot%20AD%3D%28AD%29%5E2n-AD%285AB%2BCDn%29%5C%5Cn~BC%3DADn-5AB-CDn%5C%5C5AB%3DADn-BCn-CDn%5C%5C5AB%3D%28AD-BC-CD%29n%5C%5C5AB%3DABn%5C%5C%5C%5C%5Cboxed%7Bn%3D5%7D" />16.

<img src="https://tex.z-dn.net/?f=%5Cdfrac%7Ba_1%7D%7Bb_1%7D%3D%5Cdfrac%7Ba_2%7D%7Bb_2%7D%3D%5Cdfrac%7Ba_3%7D%7Bb_3%7D%3Dk%5C%5C%20%5C%5C%5C%5C%5Cdfrac%7Ba_1%7D%7Bb_1%7D%2B%5Cdfrac%7Ba_2%7D%7Bb_2%7D%2B%5Cdfrac%7Ba_3%7D%7Bb_3%7D%3D%5Cdfrac%7B3%7D%7B4%7D%5C%5C%5C%5C%5C%5C3k%3D%5Cdfrac%7B3%7D%7B4%7D%5C%5C%5C%5C%5C%5Ck%3D%5Cdfrac%7B1%7D%7B4%7D%5C%5C%5C%5C%5Ctext%7BEntonces%3A%20%7D%5Cdfrac%7Ba_n%7D%7Bb_n%7D%3D%5Cdfrac%7Br_n%7D%7B4r_n%7D~%2C~%5Cforall%20n%5Cin%5C%7B1%2C2%2C3%20%5C%7D%5C%5C%20%5C%5C%5C%5C%5Ctextbf%7BDato%3A%20%7Da_1%5Ccdot%20a_2%5Ccdot%20a_3%3D225%5Cto%20r_1%5Ccdot%20r_2%5Ccdot%20r_3%3D225%5C%5C%20%5C%5C%5C%5Cb_1%5Ccdot%20b_2%5Ccdot%20b_2%3D%284r_1%29%284r_2%29%284r_3%29%3D64r_1%5Ccdot%20r_2%5Ccdot%20r_3%3D64%5Ccdot%20225%5C%5C%5C%5C%5Cboxed%7Bb_1%5Ccdot%20b_2%5Ccdot%20b_2%3D14400%7D" />.