1) 7² = 7 · 7 = 49
2) 0,4² = 0,4 · 0,4 = 0,16
3) 1,2² = 1,2 · 1,2 = 1,44
4) (1/3)² = 1/3 · 1/3 = 1/9
5) (2 2/9)² = (20/9)² = 20/9 · 20/9 = 400/81 = 4 целых 76/81
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1) 7² = 7 · 7 = 49
2) 0,4² = 0,4 · 0,4 = 0,16
3) 1,2² = 1,2 · 1,2 = 1,44
4) (1/3)² = 1/3 · 1/3 = 1/9
5) (2 2/9)² = (20/9)² = 20/9 · 20/9 = 400/81 = 4 целых 76/81