1X1X1X1=6
2+2+2=6
3+3+3-3=6
MÌNH CŨNG CHẺ BIÊT SKHOS QUÁ
1X1X1X1=6
2+2+2=6
3+3+3-3=6
MÌNH CŨNG CHẺ BIÊT SKHOS QUÁ
Chứng minh rằng 3 < 1+1/2+1/3+1/4+1/5+...+1/62+1/63<6
1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
1, Tính :
a, A = 1.(-1)+3.(-1)^2+5.(-1)^3.7+(-1)^4+9.(-1)^5
b, 1-2-3+4+5-6-7+8+...+61-62-63-64
a/ 1/2 + 5/6 + 11/12 + 19/20
b/ 1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42
c/ (1-1/3) + (1-1/15) + (1-1/35) + (1-1/63)
d/ 1/2 + 5/6 + 11/12 + ... + 9899/9900
e/ 2/3 + 14/15 + 34/35 +62/63
f/ 2/3 + 14/15 + 34/35 + ... + 9998/9999
A=\(\dfrac{2}{3}\)+\(\dfrac{14}{15}\)+\(\dfrac{34}{35}\)+\(\dfrac{62}{63}\)+\(\dfrac{98}{99}\)+\(\dfrac{142}{143}\)+\(\dfrac{194}{195}\)
Và B=5+\(\dfrac{1}{2^2}\)+\(\dfrac{1}{3^3}\)+\(^{\dfrac{1}{4^4}}\)+\(\dfrac{1}{5^5}\)+\(\dfrac{1}{6^6}\)+\(\dfrac{1}{7^7}\).So sánh A và B
Chứng minh: \(3<1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{62}+\frac{1}{63}<6\)
Tính hợp lý
1-2-3+4+5-6-7+8+9-10-11+12+..........+61-62-63+64
1+1/2+1/3+...+1/62+1/63+1/64
S=1+2+2^2+2^3+.........+2^62+2^63
Thực hiện phép tính:
a)S=1+2+2^2+2^3+...+2^62+2^63.
b)A=1+2-3-4+5+6-...+97+98-99-100
NHỚ GIẢI NHANH HỘ MIK NHÉ CÁC BẠN.