Question

A ,26/15+-7/13+-6/13-11/15 B, -3/4+4/13+-3/4×9/13+3/4 Hộ tui

Answer 1

A = (26/15 - 11/15) + (-7/13 + -6/13)

= 15/15 + -13/13

= 1 + (-1)

=0

Answer 2

a/\(\dfrac{26}{15}+-\dfrac{7}{13}+-\dfrac{6}{13}-\dfrac{11}{15}\)
\(=\left(\dfrac{26}{15}-\dfrac{11}{15}\right)-\left(\dfrac{7}{13}+\dfrac{6}{13}\right)\)
\(=1-1\)
\(=0\)
b/Sửa đề:
\(-\dfrac{3}{4}\cdot\dfrac{4}{13}+-\dfrac{3}{4}\cdot\dfrac{9}{13}+\dfrac{3}{4}\)
\(=-\dfrac{3}{4}\cdot\left(\dfrac{4}{13}+\dfrac{9}{13}\right)+\dfrac{3}{4}\)
\(=-\dfrac{3}{4}\cdot1+\dfrac{3}{4}\)
\(=-\dfrac{3}{4}+\dfrac{3}{4}\)
\(=0\)

Answer 3

câu b ko tính nhanh được, nếu đề sai thì đã có bài của ctv rồi nhé