z=(40/81*y+40/81)/y^2-(40/81*y+40/81)/y^3+(55/486*y+55/486)/y^4+14/81/y^3*(y+1)^2-7/81/y^4*(y+1)^2+7/243/y^4*(y+1)^3-92/9/y^2-1208/243/y^3-23/36/y^4+3800/243/y+311/486/x^4*(x+1)-34/27/x^4*(x+1)^2+152/243/x^4*(x+1)^3-1/162/x^4+10/x*(1/9/x^2*(x+1)^2-(1/9*x+1/9)/x^2)+5/y*(4/9*y+2/9/y*(y+1)^2-(2/9*y+2/9)/y+1/27/y^2*(y+1)^3-1/18/y^2*(y+1)^2+1/54/y^2*(y+1))-4/27/y^2*(y+1)+(4/27*y+4/27)/y^3-(11/324*y+11/324)/y^4其中x,y,属于整数。画出它们的3D图来，可以设置m,n属于【1 20】我想看:（x,y）的变化对z的影响
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