A=[900-(-2)^2].[900-(-6)^2].[900-(-8)^2].[900-9-88)^2].[900-(-900)^2]
A=[900-(-2)^2].[900-(-6)^2].[900-(-8)^2].[900-9-88)^2].[900-(-900)^2
( - 9 ) + 9 + 300 + 900
X=9+99+918+...+9900
Ai làm nhanh mình tik
So sánh:
a,
\(\frac{10^{109}+2}{10^{110}-5}\)với \(\frac{10^{110}+2}{10^{111}-5}\)
b,
\(\frac{9^{65}-1}{9^{64}+2}\)với \(\frac{9^{70}-1}{9^{69}+2}\)
c,
\(\frac{1+11+11^2+....+11^{10}}{1+11+11^2+...+11^{11}}\)với \(\frac{1+13+13^2+..+13^{10}}{1+13+13^2+...+13^{11}}\)
d,
\(1+2+2^2+...+2^{80}\)với \(2^{81}-2\)
e,
\(\frac{3}{4}+\frac{8}{9}+\frac{15}{16}+..+\frac{899}{900}\) với 29
So sánh
a) \(\frac{1+11+11^2+...+11^{10}}{1+11+11^2+...+11^{11}}\) và\(\frac{1+12+12^2+...+12^{10}}{1+12+12^2+...+12^{11}}\)
b) A=3/4+8/9+15/16+...+899/900 và B=29
giup minh phan b) nhanh nhe
3/4 .8/9 .15/16 .....899/900 = ?
A=(1-1/4).(1-1/9)...(1-1/900)
tinh nhanh 3/4*8/9*15/16*...*899/900