Question

efectuati : [ 2 1 pe 4 - 0, 6 × 1, 8 ( 3 ) ] ÷ [ 0, 2 × 3, ( 3 ) + 13 pe 36 ]

Answer 1

0,6=6/10=3/5 
1,8(3)=(183-18)/90=165/90=11/6
0,2=2/10=1/5
3,(3)=(33-3)/9=30/9=10/3

[21/4-3/5×11/6]:[1/5×10/3+13/36]
[21/4-11/10]:[2/3+13/36] amplificam pe 21/4 cu 5, pe 11/10 cu 2 si pe 2/3 cu 12
[105/20-22/20]:[24/36+13/36]
83/20:37/36=83/20×36/37=747/185