(1)1.2:X=
1
2 :
5
6 ,
1
2 x=1.2×
5
6 ,
1
2 x ÷
1
2 =1 ÷
1
2 ,
x=2;
(2)4.5-1.2X=2.7,
4.5-1.2X+1.2x=2.7+1.2x,
4.5-2.7=2.7+1.2x-2.7,
1.8÷1.2=1.2x÷1.2,
x=1.5.
(1)1.2:X=
1
2 :
5
6 ,
1
2 x=1.2×
5
6 ,
1
2 x ÷
1
2 =1 ÷
1
2 ,
x=2;
(2)4.5-1.2X=2.7,
4.5-1.2X+1.2x=2.7+1.2x,
4.5-2.7=2.7+1.2x-2.7,
1.8÷1.2=1.2x÷1.2,
x=1.5.