若x^2-y^2=30,x+y=6/5,求x-y的值急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需我需要过程，擦，

Question

若x^2-y^2=30,x+y=6/5,求x-y的值
急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需急需
我需要过程，擦，明白了么？？？？？？？？？？

Answer 1

x^2-y^2=(x+y)(x-y)=30
x+y=6/5
所以x-y
=(x^2-y^2)/(x+y)
=30÷6/5
=25