Question

упростите выражение:a)(3m-a)(a+3m)-(2a-m)(3a-m), б)(х-4y)(х+3y)+(х+3y)(3y+x)

Answer 1

9m/2-a/2-6a/2+m/2=10m/2-7a/2

x/2-12y/2+9y/2-x/2=-3y/2

или

 7m/2-7a/2-6am