Question

(200 7+7а3)-(57+20а7)=?

Answer 1

Ответ:

$(2007 + 7a {}^{3} ) - (57 + 20a {}^{7} ) = 2007 + 7a {}^{3} - 57 - 20a {}^{7} = 1950 + 7a {}^{3} - 20a {}^{7} .$