Обчисліть найзручнішим способом: 1) 20 – 19,5 + 19 – 18,5 + … + 2 – 1,5 + 1 – 0,5; 2) 30,2 – 29,2 + 28,2 – 27,2 + … + 4,2 – 3,2 + 2,2 – 1,2.​
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