Câu hỏi của Diệu Anh Vũ

Question

a. -3/7.15/13-3/7.11/13-3/7

b.-1/9.-3/5+5/-6.-3/5-7/2.3/5

HT.Phong (9A5) · Accepted Answer

$a.\dfrac{-3}{7}\cdot\dfrac{15}{13}-\dfrac{3}{7}\cdot\dfrac{11}{13}-\dfrac{3}{7}\
=-\dfrac{3}{7}\cdot\left(\dfrac{15}{13}+\dfrac{11}{13}+1\right)\
=-\dfrac{3}{7}\cdot\left(\dfrac{26}{13}+1\right)\
=\dfrac{-3}{7}\cdot3\
=\dfrac{-9}{7}\
b.\dfrac{-1}{9}\cdot\dfrac{-3}{5}+\dfrac{5}{-6}\cdot\dfrac{-3}{5}-\dfrac{7}{2}\cdot\dfrac{3}{5}\
=-\dfrac{3}{5}\cdot\left(\dfrac{-1}{9}+\dfrac{-5}{6}+\dfrac{7}{2}\right)\
=-\dfrac{3}{5}\cdot\dfrac{23}{9}\
=-\dfrac{23}{15}$Câu trả lời: $a.\dfrac{-3}{7}\cdot\dfrac{15}{13}-\dfrac{3}{7}\cdot\dfrac{11}{13}-\dfrac{3}{7}\
=-\dfrac{3}{7}\cdot\left(\dfrac{15}{13}+\dfrac{11}{13}+1\right)\
=-\dfrac{3}{7}\cdot\left(\dfrac{26}{13}+1\right)\
=\dfrac{-3}{7}\cdot3\
=\dfrac{-9}{7}\
b.\dfrac{-1}{9}\cdot\dfrac{-3}{5}+\dfrac{5}{-6}\cdot\dfrac{-3}{5}-\dfrac{7}{2}\cdot\dfrac{3}{5}\
=-\dfrac{3}{5}\cdot\left(\dfrac{-1}{9}+\dfrac{-5}{6}+\dfrac{7}{2}\right)\
=-\dfrac{3}{5}\cdot\dfrac{23}{9}\
=-\dfrac{23}{15}$

Chúng tôi đề xuất

Tài nguyên

Ứng dụng mobile

Bảng xếp hạng

Các khóa học có thể bạn quan tâm

Yêu cầu VIP