Номер 313.
Вычислите устно произведение и запишите, как вы рассуждали: а) 13 ⋅ 5 ⋅ 2 ⋅ 7; б) 5 ⋅ 5 ⋅ 6 ⋅ 4; в) 7 ⋅ 2 ⋅ 5 ⋅ 2 ⋅ 5; г) 2 ⋅ 9 ⋅ 5 ⋅ 5 ⋅ 4; д) 8 ⋅ 4 ⋅ 125 ⋅ 25; е) 5 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 5 ⋅ 5 ⋅ 5 ⋅ 6.
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