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若x^2-y^2=10,x+y=5则x-y=?
题目详情
若x^2-y^2=10,x+y=5 则x-y=?
▼优质解答
答案和解析
x-y
=(x-y)(x+y)÷(x+y)
=(x²-y²)÷(x+y)
=10÷5
=2
=(x-y)(x+y)÷(x+y)
=(x²-y²)÷(x+y)
=10÷5
=2
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