A)3а/b × b/6a=1/2
б)3a/b^2 ÷ 12a^3/b^3=b/4a^2
в)4а/5b ÷ 2a^2/15b^2=4a/5b × 15b^2/2a^2=3b/2
г)18m^3/5n^2 ÷ 25n/12m^2= 3m×5/2n=15m/2n
д) 6х × а/3х^2=2а/Х
е) 7х^3/у^2 ÷ (14х^2)=7х^3/у^2 × 1/14х^2=х/2у^2
#2
а) 3×2 (х-2)/х (х-2)×х=6/2х^2
б) 5 (х-5)×2 (3у+5)/(3у+5)(х-5)(х+5)=10/х+5
в) (х+4)(х-4)×4х/8х^3×(х+4)=х-4/2х^2
г) (5-у)×3у^2/2у×(у-5)(у+5)= - (у-5)×3у^2/2у×(у-5)(у+5)= - 3у/2 (у+5)
д) (с+2)^2×(с-3)(с+3)/2(с-3)×5 (с+2)=(с+2)(с+3)/10=с^2+3с+2с+6/10=с^2+5с+6/10
е) -(с+d)×c (3-2c)/(3-2c)×(c+d)^2= -c/c+d