Выполните умножение:
3)b^2/10*5/b;
6)3*x/4*1/x;
9)5*a/8*y*7/10;
12)3/4*a^3*16*a^2/9;
15)18/c^4*c^3/24;

b^2/10 ×5/b=b^2/5 ×1/b=b/5=0,2b

3x/4 ×1/x=3/4

5a/8y ×7/10=a/8y ×7/2=7a/16y

3/4a^3 ×16a^2/9=3/4a^3 ×(4a/3)^2=1/a ×4/3=4/3a=1 1/3a

18/c^4 ×c^3/24=18/c ×1/24=3/c ×1/4=3/4c