Răspuns:
0,2 inversul lui este 5
1/2 +1/3+1/6=6/6=1
20/35 : (-4/7) == 4/7 × (-7/4) = 0
(3/2+4/3+5/4)²×(1/2 - 2/4)=
(3/2+4/3+5/4)²×(2/4 -2/4)=
(3/2+4/3+5/4)²=
(18/12+16/12+25/12)²=
(59/12)²=
3481/144
