Question

помогите с б в е СРОЧНОО

Answer 1

б)-14b^2/21b^4=-2*7*b^2/3*7*b^2*b^2=-2/3b^2
в) 27c^6/45c=3*9*c*c^5/5*9*c=3*c^5/5=0,6c^5
e) 30a^2c^3/48a^3c^2=5*6*a^2*c*c^2/8*6*a*a^2*c^2=5c/8a