若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/03/29 00:50:14
若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值

若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值

若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
x+y分之x-y=3
x-y=3(x+y)
x+y分之5(x-y)—2(x-y)分之x+y
=15(x+y)/(x+y)-(x+y)/6(x+y)
=15-1/6
=14又5/6