Question

tinh nhanh :1/1*2+1/2*3+1/3*4+1/4*5+1/5*6

Answer 1

1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6

= 1/1-1/6

=6/6-1/6

= 5/6

Answer 2

=5/6 nhé.

chúc Phạm Quốc Cường học tốt nhé

Answer 3

1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + 1/5 -1/6

= 1/1 - 1/6

= 5/6