1)
(3x-8y)²=3²x²-8²y²=9x²-64y²
2)
(7z+11d)²=7²z²+11²d²=49z²+121d²
3)
(3,5t-4k)²=3,5²t²-4²k²=12,25t²-16k²
4)
(5k+1,2t)²=5²k²+1,2²t²=25k²+1,44t²
5)
(2/3a-3/7b)=2/3²a²-3/7²b²=4/9a²-9/49b²
6)
(7/8c-4/7d)=7/8²c²-4/7²d²=49/64c²-16/49d²
1)
(3x-8y)²=3²x²-8²y²=9x²-64y²
2)
(7z+11d)²=7²z²+11²d²=49z²+121d²
3)
(3,5t-4k)²=3,5²t²-4²k²=12,25t²-16k²
4)
(5k+1,2t)²=5²k²+1,2²t²=25k²+1,44t²
5)
(2/3a-3/7b)=2/3²a²-3/7²b²=4/9a²-9/49b²
6)
(7/8c-4/7d)=7/8²c²-4/7²d²=49/64c²-16/49d²