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1) (0.2a - 0.3b - 0.4c)²

(0.2a - 0.3b - 0.4c)(0.2a - 0.3b - 0.4c)

0.2a(0.2a - 0.3b - 0.4c) - 0.3b(0.2a - 0.3b - 0.4c) - 0.4c (0.2a - 0.3b - 0.4c)

0.04a² - 0.06ab - 0.08ac - 0.06ab + 0.09b² + 0.12bc - 0.08ac + 0.12bc - 0.16c²

0.04a² + 0.09b² - 0.16c² - 0.06 ab - 0.06ab - 0.08ac - 0.08ac + 0.12bc + 0.12bc

**0.04a² + 0.09b² - 0.16c² - 0.12 ab - 0.16ac + 0.24bc**

2) (1/2g + 1/3h - 1/2j)²

(1/2g + 1/3h - 1/2j)(1/2g + 1/3h - 1/2j)

1/2g(1/2g + 1/3h - 1/2j) + 1/3h(1/2g + 1/3h - 1/2j) - 1/2j(1/2g + 1/3h - 1/2j)

1/4g² + 1/6gh - 1/4gj + 1/6gh + 1/9h² - 1/6hj - 1/4gj - 1/6hj + 1/4j²

1/4g² + 1/9h² + 1/4j² + 1/6gh + 1/6gh - 1/4gj - 1/4gj - 1/6hj - 1/6hj

1/4g² + 1/9h² + 1/4j² + 2/6gh - 2/4gj - 2/6hj

**1/4g² + 1/9h² + 1/4j² + 1/3gh - 1/2gj - 1/3hj**

(0.2a - 0.3b - 0.4c)(0.2a - 0.3b - 0.4c)

0.2a(0.2a - 0.3b - 0.4c) - 0.3b(0.2a - 0.3b - 0.4c) - 0.4c (0.2a - 0.3b - 0.4c)

0.04a² - 0.06ab - 0.08ac - 0.06ab + 0.09b² + 0.12bc - 0.08ac + 0.12bc - 0.16c²

0.04a² + 0.09b² - 0.16c² - 0.06 ab - 0.06ab - 0.08ac - 0.08ac + 0.12bc + 0.12bc

(1/2g + 1/3h - 1/2j)(1/2g + 1/3h - 1/2j)

1/2g(1/2g + 1/3h - 1/2j) + 1/3h(1/2g + 1/3h - 1/2j) - 1/2j(1/2g + 1/3h - 1/2j)

1/4g² + 1/6gh - 1/4gj + 1/6gh + 1/9h² - 1/6hj - 1/4gj - 1/6hj + 1/4j²

1/4g² + 1/9h² + 1/4j² + 1/6gh + 1/6gh - 1/4gj - 1/4gj - 1/6hj - 1/6hj

1/4g² + 1/9h² + 1/4j² + 2/6gh - 2/4gj - 2/6hj