Если z=5xy-y^2, то значение 〖z'〗_x (x,y)+〖z'〗_y (x,y) в точке M(1,-2) лежит в промежутке:

[a](0;3]

[a] (-4;1)

[a] (-5; -2)

[a] [0;1)

[a] (4;10)

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