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Автор - ЗлаткаНЕЗНАЙКА

фото матем 5 класс помогите

Ответ

Автор - 8286505
19*42-42*16+16*40-40*13+13*38-13*10+10*36-36*7=
=42(19-16)+40(16-13)+13*(13-10)+36(10-7)=42*3+40*3+13*3+36*3=
=3*(42+40+13+36)=3*131=393

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