作业帮(x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2 ,其中x=4,y=1
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(x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2 ,其中x=4,y=1
(x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2 ,其中x=4,y=1
(x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2 ,其中x=4,y=1
>> syms x y >> f=(x^2+y^2)*(x^2-y^2)-(x+y)^2*(x-y)^2; >> collect(f) ans = 2*y^2*x^2-2*y^4 (x^2+y^2)(x^2-y^2）-（x+y)^2(x-y)^2=30
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