Question

Đề bài là rút gọn biểu thức ạ   
e,K=3/4-3/5+3/7+3/13 phần 2,75-2,2+11/7+11/13
f  F= -6/7+6/19-6/31 phần 9/7 - 9/19 + 9/31
g G= 1/6-1/39+1/51 phần 1/3-1/52+1/68
h, H= 1/3-1/7-1/13 phần 2/3-2/7-2/13
mong mn giúp ạ

Answer 1

e: \(=\dfrac{3\left(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{13}\right)}{11\left(\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{13}\right)}=\dfrac{3}{11}\)

f: \(=\dfrac{-6\left(\dfrac{1}{7}-\dfrac{1}{19}+\dfrac{1}{31}\right)}{9\left(\dfrac{1}{7}-\dfrac{1}{19}+\dfrac{1}{31}\right)}=\dfrac{-6}{9}=\dfrac{-2}{3}\)

h: \(=\dfrac{\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}}{2\left(\dfrac{1}{3}-\dfrac{1}{7}-\dfrac{1}{13}\right)}=\dfrac{1}{2}\)