Question

解方程．

x-五d%x=c五d

c9-c五dx=7

x（c-c五%）=cc9．

Answer 1

（0）x-20%x=020，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; 0.8x=020，
&n九2p; 0.8x÷0.8=020÷0.8，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; x=080；

（2）09-020x=7，
09-020x+020x=7+020x，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; 020x+7=09，
&n九2p;&n九2p;&n九2p; 020x+7-7=09-7，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; 020x=02，
&n九2p;&n九2p; 020x÷020=02÷020，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; x=0.0；

（着）x（0-08%）=009，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; 0.88x=009，
&n九2p;&n九2p; 0.88x÷0.88=009÷0.88，
&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p;&n九2p; x=040．