Сократите дробь 63uv^2-7v^2/49uv
(63uv²-7v²)/49uv=(7v²(9u-1))/7uv=(v(9u-1)/u
(63uv² -7v²) /49uv =7v²(9u -1) /49uv =v(9u -1) /7u