1/3+13/15+33/35+31/63+.....................+9601/9603+9997/9999
\(=1-\frac{2}{3}+1-\frac{2}{15}+...+1-\frac{2}{9999}\)
\(=\left(1+1+1+1+...+1\right)-\left(\frac{2}{3}+\frac{2}{15}+\frac{2}{35}+...+\frac{2}{9999}\right)\)
\(=50-\left(\frac{2}{1.3}+\frac{2}{3.5}+...+\frac{2}{99.101}\right)\)
\(=50-\left(1-\frac{1}{101}\right)=50-\frac{100}{101}=\frac{4950}{101}\)
HTDT
Tìm M : M= 1/3+13/15+33/35+...+9601/9603+9997/9999
tính nhanh 1/3 + 13/15 + 33/35 + 61/65 +......+ 9601/9603+ 9997/9999
1/3+13/15+33/35+61/62+...+9601/9603+9997/9999
tính :
3/15+3/35+3/63+...+3/9603
\(C=\frac{1}{3}+\frac{13}{15}+\frac{33}{35}+....+\frac{9997}{9999}\)
Tìm C giúp mình nha! Các bạn giải theo cách cấp 1 nhé!
tinh nhanh
4/3-8/15+12/35-16/63+....+188/8832-192/9215+196/9603
Tìm X : a) (1/15 + 1/35 + 1/63) x X =1
b) X - (31/5 + 31/15 + 31/35 + 31/63 + 31/99 + 31/143) =9/13
Các bạn giải thật chi tiết cho mình nhé!!
1/3+13/15+33/35+61/63+97/99
Giá trị biểu thức:?
\(\dfrac{1}{3}+\dfrac{13}{15}+\dfrac{33}{35}+\dfrac{61}{63}+\dfrac{97}{99}\)
