[tex]58 \times (45 + 26) = 58 \times 71 = \boxed{4118} \\ 58 \times (45 + 26) = 54 \times 45 + 54 \times 26 = \\ = 2610 + 1508 =\boxed{ 4118}[/tex]
[tex](78 - 39) \times 25 = 39 \times 25 = \boxed{975 }\\ (78 - 39) \times 25 = 78 \times 29 - 39 \times 25 = \\ = 1950 - 975 =\boxed{ 975}[/tex]
[tex](75 + 15) \times 40 = 90 \times 40 = \boxed{3600} \\ (75 + 15) \times 40 = 75 \times 40 + 15 \times 40 = \\ = 3000 + 600 = \boxed{3600}[/tex]
[tex]72 \times (100 - 55) = 72 \times 45 = \boxed{3240} \\ 72 \times (100 - 55) = 72 \times 100 - 72 \times 55 = \\ = 7200 - 3960 =\boxed{ 3240}[/tex]
