1.
(7z+11d)²=7²z²+11²d²=49z²+121d²
2.
(5k+1,2t)²=5²k²+1,2²t²=25k²+1,44t²
3.
(7/8c-4/7d)²=7/8²c²-4/7²d²=49/64c²-16/49d²
1.
(7z+11d)²=7²z²+11²d²=49z²+121d²
2.
(5k+1,2t)²=5²k²+1,2²t²=25k²+1,44t²
3.
(7/8c-4/7d)²=7/8²c²-4/7²d²=49/64c²-16/49d²