(1)
x+0.5x=1.622 5
0.9x=1.62
0.9x÷0.9=1.62÷0.9
x=1.8
(2)2.5:5=x:8
5x=2.5×8
5x=20
5x÷5=20÷5
x=4
(3)0.2=1-
x 24
0.2+
=1-x 24
+x 24
x 24
0.2+
=1x 24
0.2+
-0.2=1-0.2x 24
=0.8x 24
×24=0.8×24x 24
x=19.2