Hướng dẫn Giải Bài 7.6 (Trang 36, SGK Toán 6, Tập 2, Bộ Kết Nối Tri Thức)

Tính a) 8,625 . (-9) b) (-0,325) . (-2,35) c) (-9,5875) : 2,95 Giải: a) 8,625 . (-9) = -(8,625.9) <img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/10032022/anh-chup-man-hinh-2022-03-10-luc-180129-zXTbqF.png" width="89" height="119" /> Vậy 8,625. (-9) = -77,625 b) (-0,325) . (-2,35) = 0,326. 2,35 <math xmlns="http://www.w3.org/1998/Math/MathML"><mo> </mo><mn>0</mn><mo>,</mo><mn>325</mn><mspace linebreak="newline"/><mo>×</mo><mn>2</mn><mo>,</mo><mn>35</mn><mspace linebreak="newline"/><mo> </mo><mo> </mo><mover><mn>01625</mn><mo>¯</mo></mover><mspace linebreak="newline"/><mo> </mo><mo> </mo><mn>0975</mn><mspace linebreak="newline"/><mn>0650</mn><mspace linebreak="newline"/><menclose notation="top"><mn>0</mn><mo>,</mo><mn>76375</mn></menclose></math> Vậy (-0,325) . (-2,35) = 0,76375 c) (-9,5875) : 2,95 = -(9,5875 : 2,95) = -(95875 : 29500)  <img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/10032022/anh-chup-man-hinh-2022-03-10-luc-175954-Ugg363.png" width="146" height="192" /> Vậy (-9,5875) : 2,95 = -3,25