It is known that a (x1, Y1), B (X2, Y2) and C (X3, Y3) are functions y=

It is known that a (x1, Y1), B (X2, Y2) and C (X3, Y3) are functions y=

It is known that a (x1, Y1), B (X2, Y2) and C (X3, Y3) are three points on the image of the function y = - 2 / x, and if X1 < 0 < x2 < X3, then Y1, Y2, Y3, size relation
Points (x1, Y1), (X2, Y2), (X3, Y3) are all points of inverse scale function
Because x1

On the function y = K / X (k > 0), there are points a (x1, Y1), B (X2, Y2), C (X3, Y3), and x1

y2

1) Y = ln (x ^ 2 + y ^ 2) find the derivative of Y at (1,0) 2) ln (4Y) = 3xy find the derivative and second derivative of Y

1) The derivative of implicit function y '= (2 x) / (x ^ 2 - 2 y + y ^ 2), the derivative of Y on (1,0) is 2
2)
Y '= (3 y ^ 2) / (3xy-1) is obtained by deriving both sides of X
Then we take the derivative and substitute y 'into y' '= (27 (- y ^ 3 + 2 x y ^ 4)) / (- 1 + 3 x y) ^ 3

3 (x ^ 2 + X + y) - 2 (x ^ 3-y ^ 3-3xy) + (- 3xy-2y ^ 3) where x = 2, y = 2

3 (x ^ 2 + X + y) - 2 (x ^ 3-y ^ 3-3xy) + (- 3xy-2y ^ 3) where x = 2, y = 2
=3x²+3x+3y-2x³+2y³+6xy-3xy-2y³
=3×4+3×2+3×2-2×2³+2×2³+6×2×2-3×2×2-2×2³
=12+6+6-16+16+12-16
=24-4
=20;
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