(1)8.5+65%x=15,
8.5+0.65x-8.5=15-8.5,
0.65x÷0.65=6.5÷0.65,
x=10;
(2)4x-1.6x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)
1
8 X-10×0.1=0.2,
1
8 X-1=0.2,
1
8 X-1+1=0.2+1,
1
8 X×8=1.2×8,
X=9.6;
(4)2x÷5=14,
2x÷5×5=14×5,
2x÷2=70÷2,
x=35.
(1)8.5+65%x=15,
8.5+0.65x-8.5=15-8.5,
0.65x÷0.65=6.5÷0.65,
x=10;
(2)4x-1.6x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)
1
8 X-10×0.1=0.2,
1
8 X-1=0.2,
1
8 X-1+1=0.2+1,
1
8 X×8=1.2×8,
X=9.6;
(4)2x÷5=14,
2x÷5×5=14×5,
2x÷2=70÷2,
x=35.