分析:①利用等式的性質(zhì),方程的兩邊同乘0.75即可;
②利用等式的性質(zhì),方程的兩邊同除以1.8即可;
③利用等式的性質(zhì),方程的兩邊同減去6.53即可.
解答:解:①x÷0.75=1.54,
x÷0.75×0.75=1.54×0.75,
x=1.155;
②1.8x=2.16,
1.8x÷1.8=2.16÷1.8,
x=1.2;
③x+6.53=21.1,
x+6.53-6.53=21.1-6.53.
x=14.57;
點(diǎn)評(píng):此題考查利用等式的性質(zhì)解方程的能力,注意等號(hào)對(duì)齊.