9 :9 + 9 : 9 - 5 : 5 = ?
tính đi tính đi, dễ lắm
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Tính (9^30 - 27^19) : 3^57 + (125^9 -25^12) : 5^24
Ai biết chỉ mình bài này đi, Gấp lắm. Mai kiểm rồi
\(\dfrac{8}{13}\) + \(\dfrac{4}{9}\) - \(\dfrac{5}{13}\) + \(\dfrac{5}{9}\) - \(\dfrac{3}{13}\)
= (\(\dfrac{8}{13}\) - \(\dfrac{5}{13}\) - \(\dfrac{3}{13}\)) + ( \(\dfrac{4}{9}\) + \(\dfrac{5}{9}\))
= \(\dfrac{8-5-3}{13}\) + \(\dfrac{9}{9}\)
= 0 + 1
= 1
8/13 + 4/9 - 5/13 + 5/9 - 3/13
=(8/13 - 5/13 - 3/13) + (4/9 + 5/9)
=(8 - 5 - 3) : 13 + 9/9
= 0 + 1
= 1
a: \(=\dfrac{48-45}{54}\cdot\dfrac{9}{4}=\dfrac{3}{54}\cdot\dfrac{9}{4}=\dfrac{27}{216}=\dfrac{1}{8}\)
b: \(=\dfrac{6}{5}+1=\dfrac{11}{5}\)
c: \(=\dfrac{7\cdot28\cdot15}{9\cdot25\cdot14}=\dfrac{1}{2}\cdot\dfrac{28}{25}\cdot\dfrac{5}{3}=\dfrac{140}{150}=\dfrac{14}{15}\)
a) \(\frac{3}{5}+\frac{11}{20}=\frac{12}{20}+\frac{11}{20}\)
\(=\frac{23}{20}\)
b) \(\frac{5}{8}-\frac{4}{9}=\frac{45}{72}-\frac{32}{72}\)
\(=\frac{13}{72}\)
c) \(\frac{9}{16}\times\frac{4}{3}=\frac{9\times4}{16\times3}\)
\(=\frac{36}{48}=\frac{3}{8}\)
a) \(\dfrac{-5}{9}-\dfrac{4}{15}+\dfrac{2}{9}-\dfrac{11}{15}\)
\(=\left(\dfrac{-5}{9}+\dfrac{2}{9}\right)-\left(\dfrac{4}{15}+\dfrac{11}{15}\right)\)
\(=\dfrac{-3}{9}-\dfrac{15}{15}\)
\(=-\dfrac{1}{3}-1\)
\(=-\dfrac{4}{3}\)
b) \(\dfrac{-8}{13}-\dfrac{7}{16}+\dfrac{21}{13}-\dfrac{1}{6}\)
\(=\left(\dfrac{-8}{13}+\dfrac{21}{13}\right)-\dfrac{7}{16}-\dfrac{1}{6}\)
\(=\dfrac{13}{13}-\dfrac{29}{48}\)
\(=1-\dfrac{29}{48}\)
\(=\dfrac{19}{48}\)
c) \(\dfrac{-15}{25}-\dfrac{14}{21}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\dfrac{-3}{5}-\dfrac{2}{3}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\left(\dfrac{-3}{5}+\dfrac{8}{5}\right)-\left(\dfrac{2}{3}+\dfrac{5}{3}\right)\)
\(=\dfrac{5}{5}-\dfrac{7}{3}\)
\(=1-\dfrac{7}{3}\)
\(=-\dfrac{4}{3}\)
a: =-5/9+2/9-11/15-4/15
=-3/9-1
=-12/9=-4/3
b: =-8/13+21/13-7/16-1/6
=1-1/6-7/16
=5/6-7/16
=19/48
c: =-15/25+8/5-2/3-5/3
=-7/3+1
=-4/3
9 : 9 + 9 ; 9 - 5 : 5 = 1 + 1 - 1
= 2 - 1
= 1
9 : 9 + 9 : 9 - 5:5
= 1 + 1 - 1
= 2 - 1
=1
Nếu các bn thấy đúng thì tk mk nha !!! ~
Ai tk mk mk tk lại và kb lun.....~~ ^^