4 задание ооочень надоо
(12c-42d)/(4c²-49d²)=6(2c-7d)/(2c-7d)(2c+7d)=6/(2c+7d) 2c+7d=6 6/6=1 36/(10c+35d)=36/5(2c+7d) 36/30=1,2 (-2c-7d)²/(2c+7d)⁴=-(2c+7d)²/(2c+7d)⁴ -36/1296=-6/216=-1/36 ответ:-1/36;1;1,2