(1)X-40%X=6,
0.6X=6,
0.6X÷0.6=6÷0.6,
X=10;
(2)X+
5
6 X=11,
11
6 X=11,
11
6 X×
6
11 =11×
6
11 ,
X=6;
(3)75%X+25%=4,
0.75X+0.25-0.25=4-0.25,
0.75X÷0.75=3.75÷0.75,
X=5.
(1)X-40%X=6,
0.6X=6,
0.6X÷0.6=6÷0.6,
X=10;
(2)X+
5
6 X=11,
11
6 X=11,
11
6 X×
6
11 =11×
6
11 ,
X=6;
(3)75%X+25%=4,
0.75X+0.25-0.25=4-0.25,
0.75X÷0.75=3.75÷0.75,
X=5.