Question

Bài 6: (1.5 điểm) Tính nhanh:15 x 14 - 1 phần 13 x 15 +14

Answer 1

13*15+14=14*15-1=1

Answer 2

\(\frac{15\times14-1}{13\times15+14}\)

\(=\frac{15\times\left(13+1\right)-1}{13\times15+14}\)

\(=\frac{15\times13+15-1}{15\times13+14}\)

\(=\frac{15\times13+14}{15\times13+14}\)

\(=1.\)

Answer 3

15x14-1/13x15+14

=15x(13+1)-1/13x15+14

=15x13+15-1/13x15+14

=15x13+14/15x13+14

=1

Answer 4

1 bạn nhé