Question

tính tích :

3/4*8/9*15/16*...899/900

/: dấu gạch

Answer 1

\(\dfrac{3}{4}\)\(\dfrac{3}{4}\cdot\dfrac{8}{9}\cdot\dfrac{15}{16}......\dfrac{899}{900}=\dfrac{1.3}{2.2}\cdot\dfrac{2.4}{3.3}\cdot\dfrac{3.5}{4.4}\cdot\dfrac{29.31}{30.30}\)

=\(\dfrac{1.2.3...29}{2.3.4...30}\cdot\)\(\dfrac{3.4.5...31}{2.3.4...30}\)

=\(\dfrac{1}{30}\cdot\dfrac{31}{2}=\dfrac{31}{60}\)

Answer 2

BỎ đi 1 \(\dfrac{3}{4}\)ở đầu nha mk đánh nhầm