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x = - 2
y = 1/3
z = - 5
a.
3x - y
3(- 2) - (1/3)
- 6 - 1/3
(- 18 - 1)/3
- 19/3
b.
2x²y - 3x
2(- 2)²(1/3) - 3(- 2)
2(4)(1/3) + 6
8/3 + 6
(8 + 18)/3
26/3
c.
8x² - 5x + 9
8(- 2)² - 5(- 2) + 9
8(4) + 10 + 9
32 + 19
51
d.
x² + y² + z²
(- 2)² + (1/3)² + (- 5)²
4 + 1/9 + 25
29 + 1/9
(261 + 1)/9
262/9
e.
9x²y³z + 2xy²z² - 10
9(- 2)²(1/3)³(- 5) + 2(- 2)(1/3)²(- 5)² - 10
(- 45)(4)(1/27) + (- 4)(1/9)(25) - 10
(- 5)(4)(1/3) + (- 4/9)(25) - 10
- 20/3 + (- 100/9) - 10
(- 20 - 30)/3 - 100/9
- 50/3 - 100/9
(- 450 - 300)/27
- 750/27
f.
3x²y - 5xy² + x - 3y + 2
3(- 2)²(1/3) - 5(- 2)(1/3)² + (- 2) - 3(1/3) + 2
4 - (- 10)(1/9) - 1
3 + 10/9
(27 + 10)/9
37/9
g.
2xyz - 8x + 3z + 4y
2(- 2)(1/3)(- 5) - 8(- 2) + 3(- 5) + 4(1/3)
20/3 + 16 - 15 + 4/3
24/3 + 1
8 + 1
9
h.
(1/2)x²y - (3/2)xy² + (1/5)y
(1/2)(- 2)²(1/3) - (3/2)(- 2)(1/3)² + (1/5)(1/3)
2/3 + 1/3 + 1/15
1 + 1/15
16/15
i.
(3/4)x³y²z - (7/2)x²y³z² + (1/5)xy⁴z
(3/4)(- 2)³(1/3)²(- 5) - (7/2)(- 2)²(1/3)³(- 5)² + (1/5)(- 2)(1/3)⁴(- 5)
(3/4)(- 8)(1/9)(- 5) - (7/2)(4)(1/27)(25) + (1/5)(10)(1/81)
(3/36)(40) - (7/54)(100) + 2/81
(1/12)(40) - 700/54 + 2/81
10/3 - 350/27 + 2/81
(270 - 1,050)/81 + 2/81
- 780/81 + 2/81
- 778/81
j.
- (1/5)y²z + (1/3)yz² + (1/2)y - 3
- (1/5)(1/3)²(- 5) + (1/3)(1/3)(- 5)² + (1/2)(1/3) - 3
1/9 + 25/9 + (1 - 18)/6
26/9 - 17/6
(156 - 153)/54
3/54
1/18