tinh nhanh 8 x ( 363636 /727272 - 2323/9292)
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a: \(=\dfrac{6}{24}\cdot\dfrac{8}{9}\cdot\dfrac{5}{10}=\dfrac{1}{8}\cdot\dfrac{8}{9}=\dfrac{1}{9}\)
b: \(=\dfrac{12}{18}\cdot\dfrac{14}{21}\cdot13=\dfrac{2}{3}\cdot\dfrac{2}{3}\cdot13=\dfrac{52}{9}\)
c: \(=\dfrac{2323}{4646}\cdot\dfrac{123123}{234234}=\dfrac{1}{2}\cdot\dfrac{123}{234}=\dfrac{41}{156}\)
35 x 12 - 15 x 28 + \(\frac{2323}{4949}-\frac{23}{49}\)+ 2010
= (420 - 420 )+ \(\left(\frac{23}{49}-\frac{23}{49}\right)\)+ 2010
= 0 + 0 + 2010 = 2010 .
35 x 12 -15 x28+2323/4949-23/49+2010
=35x12-15x28+23/49-23/49+2010
=420-420+0+2010
=0+0+2010
=2010
2323/202+2323/606+2323/1212+2323/2020+2323/3030+2323/4242+2323/5656+2323/7272+2323/9090.=
\(\frac{23\times101}{2\times101}+\frac{23\times101}{6\times101}+\frac{23\times101}{12\times101}+....+\frac{23\times101}{72\times101}+\frac{23\times101}{90\times101} \)
=\(\frac{23}{2}+\frac{23}{6}+..........+\frac{23}{72}+\frac{23}{90}\)
=\(23\times\left(\frac{1}{1\times2}+\frac{1}{2\times3}+.....+\frac{1}{9\times10}\right)\)
=\(23\times\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{9}-\frac{1}{10}_{ }\right)\)
=\(23\left(1-\frac{1}{10}\right)_{ }\)
=\(23\times\frac{9}{10}\)
==\(\frac{207}{10}\)
chúc học giỏi nha bn
\(=\dfrac{15}{23}\times\dfrac{69}{54}\times\dfrac{27}{15}\\ =\dfrac{3}{2}\)
A, chờ tí nha
B, rút gọn phân số ta được
= 27 . \(\frac{17}{27}\)- \(\frac{37}{36}\)
= 17 - \(\frac{36}{37}\)= \(\frac{649}{36}\)
a)\(\left(\dfrac{1}{9}:\dfrac{8}{27}\right):\left(\dfrac{16}{48}:\dfrac{8}{21}\right)\)
=\(\dfrac{3}{8}:\dfrac{7}{8}\)
=\(\dfrac{3}{7}\)
b)\(\dfrac{19}{23}+\dfrac{1}{9}\cdot\dfrac{36}{23}\)
=\(\dfrac{19}{23}+\left(\dfrac{1}{9}\cdot\dfrac{36}{23}\right)\)
=\(\dfrac{19}{23}+\left(\dfrac{1}{1}\cdot\dfrac{4}{23}\right)\)
=\(\dfrac{19}{23}+\dfrac{4}{23}\)
=\(\dfrac{23}{23}=1\)
c)\(\left(\dfrac{13}{23}+\dfrac{1313}{2323}-\dfrac{131313}{232323}\right)\cdot\left(\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{7}{12}\right)\)
=\(\left(\dfrac{13}{23}+\dfrac{1313}{2323}-\dfrac{131313}{232323}\right)\cdot\left(\dfrac{4}{12}+\dfrac{3}{12}-\dfrac{7}{12}\right)\)
=\(\left(\dfrac{13}{23}+\dfrac{1313}{2323}-\dfrac{131313}{232323}\right)\cdot0\)
=0
chúc bn học tốt!
= 18.( 36/72 - 23/92 )
=18. 1/4
= 9/2