a) a×b+c-b×[(a+b×c)-(a+c)]:5=
214×2+325-2×[(214+2×325)-(214+325)]:5=
428+325-2×[(214+650)-(214+325)]:5=
753-2×(864-539):5=
753-2×325:5=
753-650:5=
753-130=
=623 b) c+b×a+b×[(c-a)×b-a]=
325+2×214+2×[(325-214)×2-214]=
325+428+2×(111×2-214)=
753+2×(222-214)=
753+2×8=
753+16=
=769
