Обчислити зручно: 12,36*1,39+1,11*12,36-2,5*4,36

Question

Обчислити зручно:

12,36*1,39+1,11*12,36-2,5*4,36

Answer 1

12,36*(1,39+1,11)-2,5*4,36=12,36*2,5-2,5*4,36=2,5*(12,36-4,36)=
=2,5*8=20