(1)[2/3]x-[1/2]=42,
[1/6]x=42,
[1/6]x÷
1
6=42÷
1
6,
x=252;
(2)[2/3]:[5/6]=X:9,
[5/6]x=[2/3×9,
5
6]x=6,
[5/6]x÷
5
6=6÷
5
6,
x=7.2.
(1)[2/3]x-[1/2]=42,
[1/6]x=42,
[1/6]x÷
1
6=42÷
1
6,
x=252;
(2)[2/3]:[5/6]=X:9,
[5/6]x=[2/3×9,
5
6]x=6,
[5/6]x÷
5
6=6÷
5
6,
x=7.2.