Предмет: Математика, автор: JadePotion

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Автор ответа: Дон2006

1.=21×(13/19-3/7)=21×(91/133-57/133)=21×34/133=3×34/19=102/19=5 7/19
2.4)11/5×7/121=7/5×11=7/55
3.11/13×(51×3/22)=11/13×153/22=153/26
другой ответ
4.1) и 4)
5.2/5×(9/13×13/17)-3/5×(5/11×11/17)=2/5×9/17-3/5×5/17=18/85-15/85=3/85

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