=1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14
=1/2-1/14
=7/14-1/14=6/14=3/7
Đúng 3
Bình luận (0)
Các câu hỏi tương tự
\(\dfrac{3}{2.5}\)+\(\dfrac{3}{5.8}\)+\(\dfrac{3}{8.11}\)\(\dfrac{3}{11.14}\)+\(\dfrac{3}{14.17}\)<\(\dfrac{1}{2}\)
3.x/2.5+3.x/5.8+3.x/8.11+3.x/11.14=1/21
Tìm x biết:
3.x/2.5+3.x/5.8+3.x/8.11+3.x/11.14=1/21
Tính : \(\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}+\frac{3}{11.14}+\frac{3}{14.17}\)
\(\frac{3^2}{2.5}+\frac{3^2}{5.8}+\frac{3^2}{8.11}+\frac{3^2}{11.14}+\frac{3^2}{14.172}\)
Tìm x:
3.x/2.5+3.x/5.8+3.x/8.11+3.x/11.14+3.x/14.17= hỗn số âm 1 ba phần 5
tìm x; 3.x/2.5 + 3.x/5.8 + 3.x/8.11 + 3.x/11.14= 1/21
làm giúp mình với nha, mình đang cần gấp lắm
B= 4/2.5 + 4/5.8 + 4/8.11 + 4/11.14
B=?
B=\(\frac{3}{5.8}+\frac{3}{8.11}+\frac{3}{11.14}+...+\frac{3}{2018.2021}\)