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\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\) = \(\dfrac{42}{17}\times\dfrac{68}{63}\) = \(\dfrac{8}{3}\)
Vì \(\dfrac{21}{11}\times\dfrac{22}{17}=\dfrac{21\times22}{11\times17}=\dfrac{42}{17}\)
Vậy:
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) =
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xin mọi ngườ tick cho em nể tình em gần nhà anh Cao Phan Tuấn Anh nhé
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33/15 x 35/21 x 63/14 x 9/30
= 11/5 x 5/3 x 9/2 x 3/10
= 99/20
= \(\frac{33}{15}\)x \(\frac{5}{3}\)x \(\frac{9}{2}\)x \(\frac{3}{10}\)
= \(\frac{11}{3}\)x \(\frac{9}{2}\)x \(\frac{3}{10}\)
= \(\frac{33}{2}\)x \(\frac{3}{10}\)
= \(\frac{99}{20}\)
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a) 35 + 21 + 49 = 105
=> 105 = 21 x 5
b) 63 + 14 + 28 = 105
=> 35 x 3
k mik nha mn làm ơn nha
a ) 35 + 21 + 49
= 35 + ( 21 + 49 )
= 35 + 70
= 105
b ) 63 + 21 + 49
= 63 + ( 21 + 49 )
= 63 + 70
= 133
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Số hạng thứ 20 của dãy là: 39x41=1599
- Số hạng thứ 21 của dãy là: 41x43=1763
nhớ like cho mình nha