偏z/偏x=2sin(xy)cos(xy)*y-sin(xy)*y=2ysin(xy)cos(xy)-ysin(xy).偏z/偏y==2sin(xy)cos(xy)*x-sin(xy)*x=2xsin(xy)cos(xy)-xsin(xy).就是当做复合函数来进行求导即可，对x求偏导把y看做常数，对y求偏导同理。满意请采纳~————————————————如果其他回答者照我写的文字手写再上传的，我劝你善良。
