作业帮x^2-y^2=55,x-y=5求x+y=
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x^2-y^2=55,x-y=5求x+y=
x^2-y^2=55,x-y=5求x+y=
x^2-y^2=55,x-y=5求x+y=
x^2-y^2
=(x+y)(x-y)
=5(x+y)
=55
则x+y=11
11
x=8
y=3
x + y = (x² - y²) / (x - y) = 55÷5 = 11
x²－y²=55
(x＋y)(x－y)=55
因为：x－y=5
则：5(x＋y)=55
x＋y=11
x^2-y^2=(x+y)(x-y)=55
因为x-y=5
于是x+y=(x+y)(x-y)/(x-y)=55/5=11
x+y=11
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