Question

calcule: 4+{2.3.[2+5.2/6.(1-2/5)]}

Answer 1

4+6.(2+10/6).(-1/5)
=4+6.(12/6).(-1/5)
=4+6.2.(-1/5)
=4+12.(-0,2)
=4+(-2,4)
=1,6