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lcy1213

½ð³æ (СÓÐÃûÆø)

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syms x y z
    p=sym('[3 5]')
    z=x*y-y^2
    subs(diff(z,x),findsym(z),{3 5})

p =

[ 3, 5]



z =

x*y-y^2



ans =

(5)
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512095518

ר¼Ò¹ËÎÊ (ÕýʽдÊÖ)

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ÓÃeval(ans)£¬ÏµÍ³»áµÃµ½ÊýÖµ½á¹ûΪ5
>> syms x y z
    p=sym('[3 5]')
    z=x*y-y^2
    subs(diff(z,x),findsym(z),{3 5})

p =

[ 3, 5]


z =

- y^2 + x*y


ans =

5

>> eval(ans)

ans =

     5
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