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.ÿþ (tn, t, t), n = 1, 2, 3(t2, t, t3)(sin t, cos t, t)(cosh t, sinh t, t)sin(r)/r [-8, 8]×[-8, 8]x [-8, 8] yz = x + 2y - 2, (x, y) " [-2, 2] × [-2, 2]z = x2 + y2, (x, y) " [-2, 2] × [-2, 2]sin(xy), (x, y) " [0, 3À] × [0, À]z = ln(x2 + 4y2), (x, y) " [-2, 2] × [-2, 2]2z = e-4x -y2, (x, y) " [-2, 2] × [-2, 2]y4x2z = (1 - + )ex, (x, y) " [10, 20] × [-10, 10]2 24z = -10 |xy|, (x, y) " [-5, 5] × [-5, 5] ñøòø - y2x2xy x2 + y2 > 0z =x2 + y2óø0 x = y = 0z = -10x3y2, (x, y) " [-5, 5] × [-5, 5]2 2 2x 1z = 3(1 - x)2e-x -(y+1)2 - 10( - x3 - y5)e-x -y2 - e-(x+1) -y2, (x, y) " [-3, 3] × [-3, 3]5 3(s, t, s - t) (t + 1, s, s - t)(s + t, s - t, s2 + t2)(s2 - t2, 2st, s2 + t2)(s + t, s - t, st)(s, t, t3 - 3s2t)(sin s cos t, sin s sin t, sin s), (s, t) " [0, À] × [0, 2À](cos s, sin s, t)
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