分析:(1)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以125%求解;
(2)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以40%求解;
(3)先化簡方程,再依據(jù)等式的性質(zhì),方程兩邊同時(shí)除以25%求解;
(4)依據(jù)等式的性質(zhì),方程兩邊同時(shí)加40%,再同時(shí)減0.7,最后同時(shí)除以40%求解.
解答:解:(1)x+25%x=2.8,
125%x=2.8,
125%x÷125%=2.8÷125%,
x=2.24;
(2)(1-60%)x=0.32,
40%x=0.32,
40%x÷40%=0.32÷40%,
x=0.8;
(3)125%x-x=44,
25%x=44,
25%x÷25%=44÷25%,
x=176;
(4)1-40%x=0.7,
1-40%x+40%x=0.7+40%x,
1-0.7=0.7+40%x-0.7,
0.3÷40%=40%x÷40%,
x=0.75.
點(diǎn)評(píng):本題考查知識(shí)點(diǎn):依據(jù)等式的性質(zhì)解方程,解方程時(shí)注意對(duì)齊等號(hào).