200:200-x=200-20:200-30等于多少

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/22 11:23:00
200:200-x=200-20:200-30等于多少200:200-x=200-20:200-30等于多少200:200-x=200-20:200-30等于多少200:200-x=200-20:20

200:200-x=200-20:200-30等于多少
200:200-x=200-20:200-30等于多少

200:200-x=200-20:200-30等于多少
200:200-x=200-20:200-30
200:200-x=180:170=18:17
17×200=18(200-x)
18x=200(18-17)
x=100/9

解: 由比例式的内项和等于外项和, 得
(200-20)(200-x)=(200-30)×200
180(200-x)=170×200
9(200-x)=1700
200-x=1700/9
x=200-1700/9
=100/9
祝你开心