Tính: (1-2/2.3).(1-2/3.4).(1-2/4.5).(1-2/5.4).(1-2/98.99)
mifnh ko chac lam!:))
Tính: (1-2/2.3).(1-2/3.4).(1-2/4.5).(1-2/5.4).(1-2/98.99)
mifnh ko chac lam!:))
Tính A biết :
\(A=\left(1-\frac{2}{2.3}\right)\left(1-\frac{2}{3.4}\right)\left(1-\frac{2}{4.5}\right)....\left(1-\frac{2}{98.99}\right)\left(1-\frac{2}{99.100}\right)\)
Tính
+
1+(1+2)+(1+2+3)+...+(1+2+3+...+98) phần 1.2+2.3+3.4+...+98.99
Giúp vỚi mình cần gấp
Tính A = [1 + (1+2) + (1+2+3) + (1+2+3+4) +...+ (1+2+3+...+98)]/(1.2 + 2.3 + 3.4 +...+ 98.99)
(1-2/2.3)(1-2/3.4)(1-2/4.5)...(1-2/99.100)
tính tổng A=1.2+2.3+3.4+...+98.99
B=12+22+32+...+982
S = ( 1-2/2.3).(1-2/3.4).(1-2/4.5).....(1-2/2015.2016)
E=((2/2.3-1).(2/3.4-1).(2/4.5-1).....(2/2019.2020-1)
(1-2/2.3).(1-2/3.4).(1-2/4.5)....(1-2/101.102)
tính
\(\left(1-\frac{2}{2.3}\right).\left(1-\frac{2}{3.4}\right).\left(1-\frac{2}{4.5}\right)...\left(1-\frac{2}{99.100}\right)\)