\(\frac{1}{2}+\frac{1}{14}+\frac{1}{35}+\frac{1}{65}+\frac{1}{104}+\frac{1}{152}=\frac{2}{4}+\frac{2}{28}+\frac{2}{70}+\frac{2}{130}+\frac{2}{208}+\frac{2}{304}=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+\frac{2}{10.13}+\frac{2}{13.16}+\frac{2}{16.19}\)rồi phần còn lại em tự tính nhé
Cíuuu
Bài 1: Tính nhanh
1) B= \(\dfrac{1}{15}+\dfrac{1}{35}+\dfrac{1}{63}+\dfrac{1}{99}+\dfrac{1}{143}\)
2) C= \(\dfrac{1}{2}+\dfrac{1}{14}+\dfrac{1}{35}+\dfrac{1}{65}+\dfrac{1}{104}+\dfrac{1}{152}\)
Bài 2: Chứng minh
\(\dfrac{1}{101}+\dfrac{1}{102}+\dfrac{1}{103}+\dfrac{1}{299}+\dfrac{1}{300}>\dfrac{2}{3}\)
Tính A=1/2+1/14+1/35+1/65+1/104+1/152
Tính nhanh :1/2+1/14+1/35+1/65+1/104+152
Tính nhanh: 1/2+1/14+1/35+1/65+1/104+1/152
tính nhanh
1/2+1/14+1/35+1/65+1/104+1/152
Tính nhanh.
1/2+1/14+1/35+1/65+1/104+1/152.
1. Tính
C=1/2+1/14+1/35+1/65+1/104+1/152
Tính nhanh
C = 1/2 + 1/14 + 1/35 + 1/65 + 1/104 + 1/152
tính nhanh
A = 1/2 + 1/14 + 1/35 + 1/65 + 1/104 + 1/152
