Chứng tỏ rằng: \(\frac{1.3.5.....39}{21.22.23.....40}=\frac{1}{2^{20}}\)
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\(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
Chứng minh rằng \(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
1)CMR:
a) \(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
b) \(\frac{1.3.5...\left(2n-1\right)}{\left(n+1\right).\left(n+2\right)\left(n+3\right)...2n}=\frac{1}{2^n}\)( n thuộc N* )
Chứng minh rằng: \(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
Chứng minh rằng: \(\frac{1.3.5.....39}{21.22.23.....40}=\frac{1}{2^{20}}\)
CMR
1.3.5...39/21.22.23...40 = 1 /220
Chứng minh rằng:
a) \(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
b)\(\frac{1.3.5...\left(2n-1\right)}{\left(n+1\right)\left(n+2\right)...2n}=\frac{1}{2^n}\)
Chứng minh rằng:
a)\(\frac{1.3.5...39}{21.22.23...40}=\frac{1}{2^{20}}\)
b)\(\frac{1.3.5...\left(2n-1\right)}{\left(n+1\right)\left(n+2\right)\left(n+3\right)...2n}=\frac{1}{2^n}\)với n thuộc N*