September 2021 0 28 Report
Объясни способы выполнения сложения и вычитания 350+40=300+(50+40) ,З90-40=300+(90-40), 390-350=(300-300)+(90-50), 80+90=(80+20)+70, 170-80=(100-80)+70 , 170-90=(100-90)+70
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