9 . 23+ 23
TÍNH NHANH
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
5/23 : ( 3/26 + 7/9) - 5/23 : (23/26 + 2/9)
=\(\frac{5}{23}\)\(\div[(\frac{3}{26}+\frac{7}{9})-(\frac{23}{26}+\frac{2}{9})]\)
=\(\frac{5}{23}\div\)\([(\frac{3}{26}+\frac{23}{26})-(\frac{7}{9}+\frac{2}{9})]\)
=\(\frac{5}{23}\div[1-1]\)
=\(\frac{5}{23}\div0\)
=0
5/23 : ( 3/26 + 7/9 ) - 5/23 : ( 23/26 + 2/9 )
=5/23 : { (23/26 + 3/26) - ( 7/9 + 2/9 )
=5/23 : { 1-1 }
=5/23 : 0
=0
a) Ta có: \(\dfrac{21}{25}\cdot\dfrac{11}{9}\cdot\dfrac{5}{7}\)
\(=\dfrac{21\cdot11\cdot5}{25\cdot9\cdot7}\)
\(=\dfrac{3\cdot7\cdot11\cdot5}{5\cdot5\cdot3\cdot3\cdot7}\)
\(=\dfrac{11}{5\cdot3}=\dfrac{11}{15}\)
tính nhanh 4/3*6 + 4/6*9 + 4/9*12 +4/23*27=24.0289855072
học tốt
\(\frac{4}{3\times6}+\frac{4}{6\times9}+\frac{4}{9\times12}+\frac{4}{23\times27}\)
\(=\frac{4}{3}\left(\frac{3}{3\times6}+\frac{3}{6\times9}+\frac{3}{9\times12}\right)+\frac{4}{23\times27}\)
\(=\frac{4}{3}\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}\right)+\frac{4}{23\times27}\)
\(=\frac{4}{3}\times\frac{1}{4}+\frac{4}{23\times27}\)
\(=\frac{1}{3}+\frac{4}{23\times27}=\frac{23\times27+4}{3\times23\times27}\)
9 x 23 + 23
= 9 x 23 + 23 x 1
= 23 x ( 9 + 1 )
= 23 x 10
= 230
k mk nha
Mình cảm ơn bạn nhiều !
Thank you vitamilk
=230 tk mình nhé