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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:
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) =
Lời giải:
$\frac{21\times 45}{63\times 39}=\frac{21\times 15\times 3}{21\times 3\times 39}=\frac{15}{39}=\frac{3\times 5}{3\times 13}=\frac{5}{13}$
2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{55}{63}\) : \(\dfrac{11}{21}\)
2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{55}{63}\) x \(\dfrac{21}{11}\)
2 - \(x\) + \(\dfrac{3}{4}\) = \(\dfrac{5}{3}\)
2 - \(x\) = \(\dfrac{5}{3}\) - \(\dfrac{3}{4}\)
2 - \(x\) = \(\dfrac{20}{12}\) - \(\dfrac{9}{12}\)
2 - \(x\) = \(\dfrac{11}{12}\)
\(x\) = 2 - \(\dfrac{11}{12}\)
\(x\) = \(\dfrac{24}{12}\) - \(\dfrac{11}{12}\)
x = \(\dfrac{13}{12}\)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
a)67/63 x 15/3 + 15/31 x 11/21
Thiếu đề
b)15/31 x 34/63 - 11/21 x 15/31
=15/31 x ( 34/63 -11/21)
= 15/31 x 1/63= 5/651
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: \(=\dfrac{67}{63}\cdot5+\dfrac{11}{31}\cdot\dfrac{5}{7}=5\left(\dfrac{67}{63}+\dfrac{11}{31\cdot7}\right)=\dfrac{10880}{1953}\)
b: =15/31(34/63-11/21)=15/31x1/63=5/651
a: =67/63⋅5+11/31⋅5/7=5(67/63+11/31⋅7)=10880/1953
xin mọi ngườ tick cho em nể tình em gần nhà anh Cao Phan Tuấn Anh nhé