Question

4 задание ооочень надоо

Answer 1

(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