Pyramid 141
Preview $$U_{141}(x, y) = \frac{- x + \sqrt{x^{2} + 2 x + y \left(4 x + 4\right) + 1} - 1}{y \left(2 x + 2\right)}$$
Pyramid 142
Preview $$U_{142}(x, y) = - x + \frac{1}{y + 1}$$
Pyramid 143
Preview $$U_{143}(x, y) = \frac{\sqrt{4 x + 1} + 1}{2 - 2 y}$$
Pyramid 144
Preview $$U_{144}(x, y) = \frac{1 - \sqrt{- 2 y \sqrt{4 x + 1} - 2 y + 1}}{2 y}$$
Pyramid 145
Preview $$U_{145}(x, y) = \left(y + 1\right) \left(x y + x + 1\right)$$
Pyramid 146
Preview $$U_{146}(x, y) = \frac{y + 1}{- x \left(y + 1\right)^{2} + 1}$$
Pyramid 147
Preview $$U_{147}(x, y) = \frac{1}{- x \left(y + 1\right)^{2} + 1}$$
Pyramid 148
Preview $$U_{148}(x, y) = x y^{2} + 2 x y + x + 1$$
Pyramid 149
Preview $$U_{149}(x, y) = \frac{- 2 x y - \sqrt{- 4 x y^{2} - 4 x y + 1} + 1}{2 x y^{2}}$$
Pyramid 150
Preview $$U_{150}(x, y) = \frac{- 2 x - \sqrt{- 4 x y - 4 x + 1} + 1}{2 x}$$
Pyramid 151
Preview $$U_{151}(x, y) = \frac{1 - \sqrt{- 4 x y^{2} - 8 x y - 4 x + 1}}{2 x \left(y + 1\right)^{2}}$$
Pyramid 152
Preview $$U_{152}(x, y) = \frac{- 2 x y - \sqrt{4 x y^{2} + 4 x y + 1} - 1}{2 x - 2}$$
Pyramid 153
Preview $$U_{153}(x, y) = x \left(y + 1\right)^{3} + 1$$
Pyramid 154
Preview $$U_{154}(x, y) = - \frac{1}{x y^{3} + 3 x y^{2} + 3 x y + x - 1}$$
Pyramid 155
Preview $$U_{155}(x, y) = \frac{1 - \sqrt{- 4 x y^{3} - 12 x y^{2} - 12 x y - 4 x + 1}}{2 x \left(y + 1\right)^{3}}$$
Pyramid 156
Preview $$U_{156}(x, y) = \frac{\sqrt{4 x y^{3} + 12 x y^{2} + 12 x y + 4 x + 1}}{2} + \frac{1}{2}$$
Pyramid 157
Preview $$U_{157}(x, y) = \frac{\sqrt{4 x y^{2} + 8 x y + 4 x + 1}}{2} + \frac{1}{2}$$
Pyramid 158
Preview $$U_{158}(x, y) = \frac{y}{\left(1 - x\right)^{2}} + 1$$
Pyramid 159
Preview $$U_{159}(x, y) = \frac{\left(1 - x\right)^{2}}{- y + \left(1 - x\right)^{2}}$$
Pyramid 160
Preview $$U_{160}(x, y) = \frac{x^{2} - 2 x + \left(x - 1\right) \sqrt{x^{2} - 2 x - 4 y + 1} + 1}{2 y}$$
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