Приёмы устных вычислений вида 470+80, 560-90
Математика 3 класс , 4 четверть, Школа России.
2 months ago 00:15:34 1
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2 months ago 00:20:10 1
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4 months ago 01:26:26 1
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4 months ago 00:06:50 1
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5 months ago 00:15:10 3
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6 months ago 00:56:10 1
