分析:(1)依據(jù)等式的性質(zhì),方程兩邊同時加15.5,再同時除以4求解,
(2)依據(jù)等式的性質(zhì),方程兩邊同時加5x,再同時減0.4,最后同時除以5求解,
(3)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時除以8求解,
(4)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時除以0.95求解,
(5)依據(jù)等式的性質(zhì),方程兩邊同時減2.2,再同時除以5.6求解,
(6)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時減6,最后同時除以2求解.
解答:解:(1)4X-15.5=4.5,
4X-15.5+15.5=4.5+15.5,
4x=20,
4x÷4=20÷4,
x=5;
(2)1-5X=0.4,
1-5X+5x=0.4+5x,
1-0.4=0.4+5x-0.4,
0.6÷5=5x÷5,
x=0.12;
(3)5X+3X=1.6,
8x=1.6,
8x÷8=1.6÷8,
x=0.2;
(4)X-0.05X=5.7,
0.95x=5.7,
0.95x÷0.95=5.7÷0.95,
x=6;
(5)5.6X+2.2=30.2,
5.6X+2.2-2.2=30.2-2.2,
5.6x=28,
5.6x÷5.6=28÷5.6,
x=5;
(6)2X-2+8=48,
2x+6-6=48-6,
2x=42,
2x÷2=42÷2,
x=21.
點評:解方程時要注意:(1)方程能化簡先化簡,(2)等號對齊.