Pyramid 181
Preview $$U_{181}(x, y) = \frac{x^{2} + 2 x - \sqrt{\left(x + 1\right) \left(x^{3} + 3 x^{2} + 3 x + 4 y + 1\right)} + 1}{y \left(2 x + 2\right)}$$
Pyramid 182
Preview $$U_{182}(x, y) = - x - y + 1$$
Pyramid 183
Preview $$U_{183}(x, y) = \frac{1 - x}{y + 1}$$
Pyramid 184
Preview $$U_{184}(x, y) = \frac{1 - y}{x + 1}$$
Pyramid 185
Preview $$U_{185}(x, y) = \frac{1}{x + y + 1}$$
Pyramid 186
Preview $$U_{186}(x, y) = \frac{- x + \sqrt{x^{2} + 2 x + 4 y + 1} - 1}{2 y}$$
Pyramid 187
Preview $$U_{187}(x, y) = \frac{- y + \sqrt{4 x + y^{2} + 2 y + 1} - 1}{2 x}$$
Pyramid 188
Preview $$U_{188}(x, y) = \frac{\sqrt{4 x + 4 y + 1} - 1}{2 x + 2 y}$$
Pyramid 189
Preview $$U_{189}(x, y) = - \frac{1}{x + y \left(x^{2} - 2 x + 1\right) - 1}$$
Pyramid 190
Preview $$U_{190}(x, y) = \frac{1 - \sqrt{1 - 4 y}}{y \left(2 - 2 x\right)}$$
Pyramid 191
Preview $$U_{191}(x, y) = \frac{y - \sqrt{2 x y \sqrt{1 - 4 y} - 2 x y + y^{2}}}{2 x y}$$
Pyramid 192
Preview $$U_{192}(x, y) = \frac{2 x y - \sqrt{1 - 4 y} + 1}{2 y}$$
Pyramid 193
Preview $$U_{193}(x, y) = \frac{- \sqrt{1 - 4 y} + \sqrt{2} \sqrt{8 x y^{2} - 2 y - \sqrt{1 - 4 y} + 1} + 1}{4 y}$$
Pyramid 194
Preview $$U_{194}(x, y) = \frac{- \sqrt{1 - 4 y} - \sqrt{2} \sqrt{8 x y^{2} - 2 y - \sqrt{1 - 4 y} + 1} + 1}{4 y}$$
Pyramid 195
Preview $$U_{195}(x, y) = \frac{1}{- x + y \left(x^{2} + 2 x + 1\right) - 1}$$
Pyramid 196
Preview $$U_{196}(x, y) = - \frac{1}{x + y \left(1 - x\right)^{3} - 1}$$
Pyramid 197
Preview $$U_{197}(x, y) = \frac{1 - \sqrt{y \left(4 x - 4\right) + 1}}{y \left(2 x^{2} - 4 x + 2\right)}$$
Pyramid 198
Preview $$U_{198}(x, y) = \frac{y \left(x - 1\right)^{3} - 1}{x - 1}$$
Pyramid 199
Preview $$U_{199}(x, y) = \frac{y \left(x - 1\right)^{2} - 1}{x - 1}$$
Pyramid 200
Preview $$U_{200}(x, y) = \frac{y + \left(x - 1\right)^{2}}{1 - x}$$
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