Chứng minh: A= 1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
CHO 1/5+1/13+1/14+1/15+1/61+1/62+1/63
cHỨNG minh 3/7<S<1/2
Chứng minh:S=\(\frac{1}{5}\)+\(\frac{1}{13}\)+\(\frac{1}{14}\)+\(\frac{1}{15}\)+\(\frac{1}{61}\)+\(\frac{1}{62}\)+\(\frac{1}{63}\)<\(\frac{1}{2}\)
chứng minh rằng s=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
chứng minh 1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 1/2
Chứng tỏ rằng : 1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
CMR : 1/3+1/5+1/13+1/14+1/15+1/61+1/62+1/63<5/6
Chứng minh S = 1/5 +1/13+ /14+1/15+1/61+1/62+1/63 < 1/2
chứng minh rằng: S=1/5+1/13+1`/14+1/15+1/61+1/62+1/63<1/2
