Ta có : 1.3.5.7. ... .59
= \(\frac{1.2.3.4.5.....58.59.60}{2.4.6.8.....58.60}\)
= \(\frac{\left(1.2.3.....30\right).\left(31.32.....60\right)}{\left(1.2.3.....30\right).2.2.....2}\)
= \(\frac{31.32.....60}{2.2.....2}\)
= \(\frac{31}{2}.\frac{32}{2}.....\frac{58}{2}.\frac{60}{2}\) ( đpcm )
CMR: 31/2 . 32/2 . 33/2 ... 60/2 = 1.3.5.7..59
chứng tỏ rằng
31/2+32/2+33/2+....+60/2=1.3.5....59
chứng tỏ rằng :
31 / 2 x 32 / 2 x 33 / 2... x 60 / 2 = 1 x 3 x 5 ... x 59
Chứng tỏ rằng \(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}...\frac{60}{2}=1.3.5...59\)
Chứng tỏ rằng:
\(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}...\frac{60}{2}=1.3.5...59\)
Chứng tỏ rằng
\(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}...\frac{60}{2}=1.3.5...59\)
So sánh \(P=\frac{31}{2}.\frac{32}{2}.\frac{33}{2}...\frac{60}{2}\) và Q=1.3.5.7........59
Chứng tỏ:
\(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}.\frac{34}{2}....\frac{60}{2}=1.3.5....59\)
chứng tỏ: \(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}......\frac{60}{2}=1.3.5......59\)
