Tinh 2S, roi lay 2S-S=1-1/2^100
ban co the giai thich cu the hon duoc khong?
=)2S-S=(1+1/2+1/2^2+......+1/2^99)-(1/2+1/2^2+1/2^3+......+1/2^100)
=)S=1-1/2^100
=)S=2^100-1/2^100
Cứ chép vào đáp ản chuẩn nhớ là ko cần tính rõ ra=)))
Tinh 2S, roi lay 2S-S=1-1/2^100
ban co the giai thich cu the hon duoc khong?
=)2S-S=(1+1/2+1/2^2+......+1/2^99)-(1/2+1/2^2+1/2^3+......+1/2^100)
=)S=1-1/2^100
=)S=2^100-1/2^100
Cứ chép vào đáp ản chuẩn nhớ là ko cần tính rõ ra=)))
Rut gon bieu thuc sau
A=\(\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{100}}\)
rut gon bieu thuc sau
a . S=1+\(\frac{1}{3}+\frac{1}{^{^{3^2}}}+\frac{1}{3^3}+...+\frac{1}{3^n}\)
Rut gon bieu thuc : 1 +\(\frac{1}{2}+\frac{1}{2^2}\)+\(\frac{1}{2^3}\)+.......+\(\frac{1}{2^{2012}}\)
cho bieu thuc A =\(\frac{a^3+2a^2-1}{a^3+2a^2+2a+1}\)
a)rut gon bieu thuc
b)chung minh rang neu a la so nguyen thi gia tri cua bieu thuc tim duoc o cau a la mot phan so toi gian
\(A=\frac{a^3+2a^2-1}{a^3+2a^2+2a+1}\)
a/ Rut gon bieu thuc
b/ Chung minh rang neu a la so nguyen thi gia tri cua bieu thuc tim duoc o cau a, la mot phan so toi gian
Rut gon \(A=\left(\frac{1}{2^2}-1\right).\left(\frac{1}{3^2}-1\right).\left(\frac{1}{4^2}-1\right)....\left(\frac{1}{100^2}-1\right)\)
\(A=\frac{a^3+2a^2-1}{a^3+2a^2+2a+1}\)
a)rut gon bieu thuc
b)chung minh rang neu a la so nguyen thi gia tri cua bieu thuc tim duoc cua cau a la mot phan so toi gian
RUT GON P/S \(\frac{1^3+2^3+3^3+...+100^3}{1.5+2.8+3.11+...+100.302}\)
rut gon bieu thuc sau:
a) 34^2+35^2+........+100^2
b)1^2+3^2+5^2+...+99^2