Tính Nhanh : a) \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+....+\frac{1}{99.101}\)
b) \(\frac{1}{3.6}+\frac{1}{6.9}+\frac{1}{9.12}+\frac{1}{12.15}\)
\(A=\frac{5}{3.6}+\frac{5}{6.9}+\frac{5}{9.12}+..........+\frac{5}{96.99}\)
\(\frac{4}{3.6}+\frac{4}{6.9}+.........\frac{4}{27.30}\)
\(F=\frac{2}{3.6}+\frac{2}{6.9}+\frac{2}{9.12}+...+\frac{2}{30.33}+\frac{3}{33.36}\)=?
2.4*3+1.8*4+1.2*6+3.6*2+14.4+7.2*4
A=1.2+2.4+3.6+4.8+5.10phần3.4+6.8+9.12+12.16+15.20 B=11111PHần666665
sO SÁNH 2 SỐ A và B
So Sánh
\(A=\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
và \(B=\frac{111111}{666666}\)
So sánh A và B
A = \(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
B = \(\frac{111111}{666665}\)
A=1.2+2.4+3.6+4.8+5.10/3.4+6.8+9.12+12.16+15.20 B=111111/666665
so sanh 2 so A va B