解方程0.4x+0.9=0.3分之0.3+0.2x+1 对的还加悬赏 不太会这道题
3个回答

0.5分之0.4x+0.9=0.3分之0.3+0.2x+1

0.4x/0·5 +0.9/0·5=0·3/0·3 +0.2x/0·3 +1/0·3(说明:0.5分之0.4x+0.9=0.4x/0·5 +0.9/0·5,0.3分之0.3+0.2x+1=0·3/0·3 +0.2x/0·3 +1/0·3)

4/5x +9/5 =1+2/3x+ 10/3

两边同乘以15得

12x+27=15+10x+50

2x=38

x=19