Ответ:
42 4/10 × 1/2 - 2 4/10 × 1/2 = 21 2/10 - 1 2/10= 20
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Ответ:
42 4/10 × 1/2 - 2 4/10 × 1/2 = 21 2/10 - 1 2/10= 20