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mingdong(½ð±Ò+1,VIP+0):¸Ðл½»Á÷£¡ 12-15 19:14
Do you mean Z=f(x,y)? If so, you can use mesh function
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mingdong(½ð±Ò+1,VIP+0):¸Ðл½»Á÷£¡ 11-12 13:06
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f(x,y,z)*(x^2+y^2+z^2>20)
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