tất cả rút gọn = 1 /2
và GẠCH TỬ SỐ,MẪU SỐ GIỐNG NHAU
kết quả = 1 nhé
Coi mk làm nha
1/2+1/4+1/8+....+1/2048
=1+1/2+1/4+1/8+.....+1/2048
=(1+1/2+.....+1/2048)-(1/2+1/4+...+1/2048)
=1-1/2048
=2047/2048
1.Tính:
8 :8= 16:8= 24:8=
32:8= 40:8= 48:8=
56:8= 64:8= 72:8=
80:8=
2.Số?
\(...\times\frac{1}{8}=1\) \(...\times\frac{1}{8}=2\)\(...\times\frac{1}{8}=3\)\(...\times\frac{1}{8}=4\)
\(...\times\frac{1}{8}=5\) \(...\times\frac{1}{8}=6\)\(...\times\frac{1}{8}=7\)
\(...\times\frac{1}{8}=8\)\(...\times\frac{1}{8}=9\)
\(...\times\frac{1}{8}=10\)
Sắp xếp các số từ bé đến lớn: \(\frac{1}{8}\), \(\frac{1}{6}\), \(\frac{1}{2}\), \(\frac{1}{9}\), \(\frac{1}{4}\), \(\frac{1}{3}\), \(\frac{1}{7}\), \(\frac{1}{5}\), \(\frac{1}{10}\), \(\frac{1}{100}\), \(\frac{1}{1000}\).
\(12\div\frac{1}{4}=?\times3\)
\(\frac{1}{2}\times10+8+6=?\)
\(50+\frac{1}{2}\times5=?\)
\(CMR:\frac{1}{1^2}+\frac{1}{2^2}+\frac{1}{3^2}+...+\frac{1}{50^2}< 2\)
Cho \(M=\frac{\sqrt{2}-\sqrt{1}}{1+2}+\frac{\sqrt{3}-\sqrt{2}}{2+3}+\frac{\sqrt{4}-\sqrt{3}}{3+4}+...+\frac{\sqrt{2015}-\sqrt{2014}}{2014+2015}\). Hãy so sánh M với \(\frac{1}{2}\)
Tính :
\(B=\frac{-1}{3}+\frac{1}{3^2}-\frac{1}{3^3}+...+\frac{1}{3^{50}}-\frac{1}{3^{51}}\)
a)\(\frac{1}{5}\)x(a+\(\frac{4}{7}\))=\(\frac{2}{8}\) b)\(\frac{5x}{4}\)-\(\frac{1}{7}\)=\(\frac{2}{5}\)
\(\frac{1}{2}\times10+9=\hept{\begin{cases}?\\+\\5\end{cases}}\)
\(\frac{1}{2}+\frac{1}{2}+56+9+1\hept{\begin{cases}?\\+\\12\end{cases}}\)
\(\frac{1}{2}+\frac{1}{2}\times3+9\hept{\begin{cases}?\\+\\6\end{cases}}\)
\(\frac{1}{2}\times6+67\hept{\begin{cases}?\\+\\13\end{cases}}\)
\(\frac{1}{2}+\frac{1}{2}\times8+7\hept{\begin{cases}?\\+\\6\end{cases}}\)
5 BÀI TOÁN NHÉ!
Tính tổng dãy số vô hạn sau:
a)\(\frac{1}{3-2+6}+\frac{2}{3-2+6}+\frac{3}{3-2+6}+...\)
b)\(\frac{2}{4\times8}+\frac{4}{4\times8}+\frac{6}{4\times8}+...\)
c)\(1+2-3+4-5+...\)
d)\(\left(-10\right)+\left(-11\right)+\left(-12\right)+...\)
