Question

Tính nhanh: 

15 - 15/7 - 15/12 /  3 - 3/7 - 3/12

Answer 1

\(\frac{15-\frac{15}{7}-\frac{15}{12}}{3-\frac{3}{7}-\frac{3}{12}}\)

= \(\frac{15.\left(1-\frac{1}{7}-\frac{1}{12}\right)}{3.\left(1-\frac{1}{7}-\frac{1}{12}\right)}\)

= \(\frac{15}{3}\)

= 5

Answer 2

=  15/3

=5

Answer 3

15-\(\frac{15}{7}\)-\(\frac{15}{12}\)

3-\(\frac{3}{7}\)-\(\frac{3}{12}\)

=15.[1-\(\frac{1}{7}\)-\(\frac{1}{12}\)]

3.[1-\(\frac{1}{7}\)-\(\frac{1}{12}\)]

=\(\frac{15}{3}\)=5

Answer 4

tôi đang bị khó bài này nè