f=7x+8y-xy-z=0
f1`(x-x0)+f2`(y-y0)+f3`(z-z0)=0
f1`=df/dx=7-y; f2`=df/dy=8-x; f3`=df/dz=-1
(7-y)(x-1)+(8-x)(y-1)+(-1)(z-14)=0-уравнение касательной пл-ти
7x-7-xy+y+8y-8+xy+x-z+14=0
8x+9y-z-1=0
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f=7x+8y-xy-z=0
f1`(x-x0)+f2`(y-y0)+f3`(z-z0)=0
f1`=df/dx=7-y; f2`=df/dy=8-x; f3`=df/dz=-1
(7-y)(x-1)+(8-x)(y-1)+(-1)(z-14)=0-уравнение касательной пл-ти
7x-7-xy+y+8y-8+xy+x-z+14=0
8x+9y-z-1=0