3/1.4 + 3/4.7 + .. +3/13.16
= 1/1 - 1/4 + 1/4 - 1/7 + 1/7 - 1/10 + 1/10 - 1/13 + 1/13 - 1/16
= 1/1 - 1/16
= 15/16
\(=\frac{15}{16}\)
đúng cho mk nha Minh Thư Nguyễn
1) 1/6+1/12+1/30+1/42+1/56+1/72
2) 3/1.4+3/4.7+3/7.10+3/10.13+3/13.16
tính nhanh : A = 3 mũ 2 / 1.4 + 3 mũ 2 /4.7 + 3 mũ 2 / 7.10 + 3 mũ 2 / 10.13 + 3 mũ 2 / 13.16 + .... + 3 mũ 2 / 97.100
Tính :
\(A=\frac{3^2}{1.4}+\frac{3^2}{4.7}+\frac{3^2}{7.10}+\frac{3^2}{10.13}+\frac{3^2}{13.16}+...+\frac{3^2}{97.100}\)
3/1.4+3/4.7+3/7.10+3/10.13+3/13.6
3/1.4+3/4.7+3/7.10+3/10.13
Tính nhanh: \(\frac{3^2}{1.4}+\frac{3^2}{4.7}+\frac{3^2}{7.10}+\frac{3^2}{10.13}+\frac{3^2}{13.16}+...+\frac{3^2}{97.100}\)
Tìm x biết:
x/1.4+x/4.7+x/7.10+x/10.13+x/13.16=5/2
\(\text{A=}\frac{3^2}{1.4}+\frac{3^2}{4.7}+\frac{3^2}{7.10}+\frac{3^2}{10.13}+\frac{3^2}{13.16}+...+\frac{3^2}{97.100}\)
Loi giai day du gium minh nha may ban
minh dang gap
Tìm x biết :
x/1.4+x/4.7+x/7.10+x/10.13+x/13.16=5/2
Bạn nào trả lời mình tick cho nhé!
