(x^2+y^2)(x^2+y^2+5)-36=0求x^2+y^2的值
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(x^2+y^2)(x^2+y^2+5)-36=0求x^2+y^2的值(x^2+y^2)(x^2+y^2+5)-36=0求x^2+y^2的值(x^2+y^2)(x^2+y^2+5)-36=0求x^2+
(x^2+y^2)(x^2+y^2+5)-36=0求x^2+y^2的值
(x^2+y^2)(x^2+y^2+5)-36=0
求x^2+y^2的值
(x^2+y^2)(x^2+y^2+5)-36=0求x^2+y^2的值
将x^2+y^2看做一个整体,设x^2+y^2=t,则t≥0
原方程等价于
t（t+5）-36=0,分解因式有
（t+9）（t-4）=0,∵t≥0,∴解得t=4
等于4
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5x(x-y)+2y(x-y)
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