(1)120%x-
X=6.8,11 12
x=6.8,17 60
x÷17 60
=6.8÷17 60
,17 60
x=24;
(2)4x+0.4x=70.4,
4.4x=70.4,
4.4x÷4.4=70.4÷4.4,
x=16;
(3)x×(1-
)=3.6,1 4
x×
=3.6,3 4
x×
÷3 4
=3.6÷3 4
,3 4
x=4.8;
(4)
-1 2
x=4 5
,1 10
-1 2
x+4 5
x=4 5
+1 10
x,4 5
?1 2
=1 10
+1 10
x?4 5
,1 10
÷2 5
=4 5
x÷4 5
,4 5
x=
1